My $67 sound dampening / undercoating [Archive] - Toyota Yaris Forums

CTScott

01-23-2012, 12:14 PM

I have been meaning to paint the inside of the wheel wells since I bought my Yaris to get rid of the patchy look of some visible paint and some patches of seam sealer.

This Saturday I was planning on doing an oil change and figured I would do something with the wheel wells while I had it up on the lift. Doing a little research on coatings for the wheel wells, I found that Herculiner paint-on truck bed coating seemed to be a good choice. It is a urethane rubber based coating and is promoted as being for both truck bed protection and undercoating. For $67 for a gallon, I figured it was worth a shot. I wanted something that could be brushed on to avoid the mess of overspray.

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I initially applied two coats to the wheel wells. I then got under the car and coated the floor pan. This morning it was done curing, so I took it out for a test run. The roads were wet and coated with sand from Saturday's snow storm. I was extremely impressed with the sound dampening that the coating provided.

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Altitude

01-23-2012, 12:49 PM

Nice. Very jealous of your lift. :cry:

fnkngrv

01-23-2012, 01:03 PM

Additional weight?

enviri

01-23-2012, 01:43 PM

nice! I went with the more traditional fatmat at 1$/sq foot lol. I used only 50ft out of the 100 i bought, but plan on using a weee bit more when it warms up for the extremely noisy engine.

CTScott

01-23-2012, 01:53 PM

Additional weight?

Negligible as compared with something like dynamat. An entire gallon weighs about 10 lbs and I only used about 1/3 of the gallon. I think I have enough left to do Crashy and my Tacoma.

fnkngrv

01-23-2012, 11:39 PM

Negligible as compared with something like dynamat. An entire gallon weighs about 10 lbs and I only used about 1/3 of the gallon. I think I have enough left to do Crashy and my Tacoma.

wow...very nice! you should coat all over crashy...haha...that would be interesting

Deathegg

01-24-2012, 03:16 PM

Additional weight?

Even if it weighed 50 lbs, it would have a negligible effect on...well, anything! I plan to do something like this soon, the road noise is bad on these cars. Thank God the engine is fairly quiet at speed.

Good job! I never thought of bed coating... It dries very hard then?

mazilla

01-24-2012, 03:19 PM

Man, that lift is awesome...I'm drooling all over my desk!

josh044

01-24-2012, 05:38 PM

Very nice - I'd love to do some sound deadening work at some point. It would be interesting to see someone do a before and after sound level test. I wonder what fixes have the most payoff.

CTScott

01-24-2012, 06:34 PM

Deathegg - The Herculiner cures firm but flexible. It is urethane and is probably about half the durometer of roller blade wheels.

Josh044 - On Sunday night I was watching Wheeler-Dealers and they bought an old pickup to resell. The thing was loud as could be, so they bought a sound insulation kit for it. Before and after they did a sound level test and I sat there watching it going - Dang, I should have done that. I even have a good sound meter app for the iPhone.

yarisugi

01-24-2012, 10:25 PM

Looks like $67 well spent. Did you have to pressure wash the dirt out before applying or just slapped it on?
Also curious about how much sound it helped block out. Damn your iPhone and that hindsight of yours! heehee.

CTScott

01-24-2012, 10:28 PM

Looks like $67 well spent. Did you have to pressure wash the dirt out before applying or just slapped it on?

I pressure washed it with Simple Green (and vacuumed all of the pebbles out of the leading edge of the rear wheel wells) before painting it.

fnkngrv

01-25-2012, 12:22 AM

Even if it weighed 50 lbs, it would have a negligible effect on...well, anything! I plan to do something like this soon, the road noise is bad on these cars. Thank God the engine is fairly quiet at speed.

Good job! I never thought of bed coating... It dries very hard then?

Not to burst your bubble, but you are incorrect. I can attest to that easily. 50lbs is 50lbs and will affect acceleration and braking. I see a very noticeable difference rolling on 15s as opposed to my 18s as well as whether or not I have my subwoofer box in the trunk or do not. Performing a spare tire delete even makes a difference. Every change you make to a car that is designed like the Yaris has an impact and you need to weigh the pros/cons. An example is going boosted and not only that, but whether or not you go SC or turbo when you gauge your FE. You very well trade FE for power.

Deathegg

01-25-2012, 09:51 PM

Not to burst your bubble, but you are incorrect. I can attest to that easily. 50lbs is 50lbs and will affect acceleration and braking. I see a very noticeable difference rolling on 15s as opposed to my 18s as well as whether or not I have my subwoofer box in the trunk or do not. Performing a spare tire delete even makes a difference. Every change you make to a car that is designed like the Yaris has an impact and you need to weigh the pros/cons. An example is going boosted and not only that, but whether or not you go SC or turbo when you gauge your FE. You very well trade FE for power.

Wow, you must have a very sensitive backside if you notice the performance difference in 50 lbs. That's about 8 gallons of gas in the tank. If I take out the spare tire, my butt will not notice the difference. I would have to have a ScanGauge or similar instrumentation to tell the difference in MPG, acceleration, etc. Now, if you're talking about wheels and tires, that's a big difference in unsprung weight between 15" and 18". You'll notice that more than other weight reduction/increase.

Viperoni

01-25-2012, 11:32 PM

Wow, you must have a very sensitive backside if you notice the performance difference in 50 lbs. That's about 8 gallons of gas in the tank. If I take out the spare tire, my butt will not notice the difference. I would have to have a ScanGauge or similar instrumentation to tell the difference in MPG, acceleration, etc. Now, if you're talking about wheels and tires, that's a big difference in unsprung weight between 15" and 18". You'll notice that more than other weight reduction/increase.

Completely correct, you're noticing the unsprung weight difference, which coutns 4-10 times more than regular weight.

I can just barely feel the difference when I pull my sub box + amp out... and it's pushing 90lbs.

CTScott, do you have any vids of your mufflerless exhaust? Just wondering how it sounds.

CTScott

01-25-2012, 11:34 PM

Completely correct, you're noticing the unsprung weight difference, which coutns 4-10 times more than regular weight.

I can just barely feel the difference when I pull my sub box + amp out... and it's pushing 90lbs.

CTScott, do you have any vids of your mufflerless exhaust? Just wondering how it sounds.

It's actually the stock exhaust/muffler with a Toyota Thailand dual exhaust tip.

Viperoni

01-25-2012, 11:37 PM

It's actually the stock exhaust/muffler with a Toyota Thailand dual exhaust tip.

I'm going to go ahead and delete my post, I just missed the forest for the trees lol.

PHXDEMON

01-26-2012, 12:10 AM

Black_griffin6

01-26-2012, 12:15 AM

I've been wanting to get rid of some of that road noise that tends to plague the Yaris, but I don't want to add a ton of weight to the car with sound deadening.

I think this might be my solution. :thumbsup:
You think if I just do the wheel wells then it will make a difference? I probably won't be able to get to the underside of the car due to my lack of a lift.

SAV912

01-26-2012, 12:47 AM

Not to burst your bubble, but you are incorrect. I can attest to that easily. 50lbs is 50lbs and will affect acceleration and braking. I see a very noticeable difference rolling on 15s as opposed to my 18s as well as whether or not I have my subwoofer box in the trunk or do not. Performing a spare tire delete even makes a difference. Every change you make to a car that is designed like the Yaris has an impact and you need to weigh the pros/cons. An example is going boosted and not only that, but whether or not you go SC or turbo when you gauge your FE. You very well trade FE for power.

Unsprung weight =/= dead weight. There will be a noticable difference on weight attached to parts of the car that directly handle the power vs weight somewhere else in the vehicle. That's why lighter wheels and tires are more noticable than removing the spare tire or a subwoofer.

But if you notice 50 lbs (which must be a hell of a hard hitting woofer), then more power to you. My butt dyno isn't that sensitive.

Scott, I'm thoroughly envious of your lift. And I may do the rubber brush on coating now. I've already done spray on bedliner and it made an appreciable difference, but I only did two coats on the wheel wells. I didn't do anything under the center of the car.

-C

henrylee

01-26-2012, 04:09 AM

So jealous of your garage!!! Money well spent

pennyracer

01-26-2012, 11:56 AM

wow 50 lbs will slow you down guess mine must really be slow then but i cant hear anyone honking at me with the quitness i have in mine i will take the extra weight over road noise any day that is a clean under coat job i have thaught about doing that myself some day http://i214.photobucket.com/albums/cc74/boydstir2291/RANDOM-INSTALLS481.jpg

fnkngrv

01-26-2012, 02:38 PM

not to hijack the thread, but all I can say is that when I went and did my LSRs I noticed a difference with certain things removed.

Scott, great idea. I might have to do it myself when I have my body work done.

josh044

01-26-2012, 04:06 PM

Pennyracer - how much time did all that sound deadening work take?

pennyracer

01-26-2012, 04:57 PM

oh there is hours of work there not sure lost count that was the first layer i have 2 layers down and the roof is the same but i added dynamat foam layer also to make sure its nice and tight for the sound system i have in my lb :) never can go wrong with any sound deadening work to the yaris they need all you can give them

SAV912

01-27-2012, 01:27 AM

Holy crap, Penny. That's looks like a few hundred bucks in sound deadening. I've done truck bed liner on the spare tire floor but that's it. I really want to Dynamat the interior like that but time is a factor. I generally don't have enough days off lined up to tear stuff apart and lay it all down and put it back together.

-C

Spidermandud

04-10-2012, 01:51 AM

Did the CtScott Special over the weekend; lovin it!

devinlamothe

04-10-2012, 04:29 PM

CTScott

04-10-2012, 04:34 PM

Would this stuff be the same?

http://www.canadiantire.ca/AST/browse/4/Auto/VehicleAccessories/TruckAccessories/PRD~0478001P/Dupli-Color+Bed+Armor+Truck+Bed+Liner%2C+Gallon+Kit.jsp? locale=en

Dupli-Color Bed Armor Truck Bed Liner if you can't see the link.

Also, did you have to sand the paint in the wheel well or did you just clean + paint?

That's the same stuff. The kit is more expensive, since it includes a roller, etc.

I didn't sand, but rather just cleaned very well using simple green and painted.

devinlamothe

04-10-2012, 05:29 PM

That's the same stuff. The kit is more expensive, since it includes a roller, etc.

I didn't sand, but rather just cleaned very well using simple green and painted.

Awesome thanks. I am going to do this when it's nicer out to help prevent rock/salt damage. Thanks for the idea and the pics :thumbup:

birdman

12-30-2012, 03:48 AM

That undercoating looks do-able even for me. The road noise on grainy pavement is tiresome alright. When you get the stuff on you how do you get it off?

CTScott

12-30-2012, 08:32 AM

That undercoating looks do-able even for me. The road noise on grainy pavement is tiresome alright. When you get the stuff on you how do you get it off?

Ideally you don't get it on you. Acetone works somewhat for getting it off skin. If you don't slather it on too thick it won't drip.

MyzticZ3r0

12-30-2012, 03:16 PM

That lift works wonder for you! It looks great and I'm glad to hear road noise is cut down. Thanks for the awesome photos as well!

Driftw00d

02-06-2013, 03:28 AM

Does it come off easy if you want to take off the bolts underneath there?

CTScott

02-06-2013, 07:58 AM

Does it come off easy if you want to take off the bolts underneath there?

It really doesn't come off, but bolts break loose without a problem.

nookandcrannycar

02-07-2013, 05:22 PM

Performing a spare tire delete even makes a difference. .

:thumbsup: Good to know. For everyday driving (unless going away on a trip), I'm going to remove mine. I have tire sealant and am paying extra for AAA plus coverage (longer free towing range). I've never needed either within my metro, but they'd be available if need be. Normally painless and transparent ways to increase MPG = all good in my book. I just thought (not based on more than a vague hunch really) removing it wouldn't make any difference. I trust your judgement. I don't think you would write this unless you had noticed a difference (even if it isn't much). Come to think of it, I can't remember the last time I had to put the spare to use in a car.

nookandcrannycar

02-07-2013, 05:53 PM

^^^^^ Oops :redface:. I just read your other posts (and other's posts) on this thread and realize the difference you are referring to = in performance not MPG. Amazingly faulty assumption on my part, especially since you are 'Mr. 143'. Re my Yaris, I am probably too clouded by MPG as a first thought.

nookandcrannycar

02-07-2013, 05:56 PM

^^^^^^^^^^^^^^^^^ Above (post #37 meant to appear below #36 but system posted to top of new page instead)
:thumbsup: Good to know. For everyday driving (unless going away on a trip), I'm going to remove mine. I have tire sealant and am paying extra for AAA plus coverage (longer free towing range). I've never needed either within my metro, but they'd be available if need be. Normally painless and transparent ways to increase MPG = all good in my book. I just thought (not based on more than a vague hunch really) removing it wouldn't make any difference. I trust your judgement. I don't think you would write this unless you had noticed a difference (even if it isn't much). Come to think of it, I can't remember the last time I had to put the spare to use in a car.

UberSilver

02-07-2013, 07:26 PM

wow...very nice! you should coat all over crashy...haha...that would be interesting

Took 3 gallons for 2 thick coats on my LC:biggrin:

CTScott

02-07-2013, 10:33 PM

enviri

02-07-2013, 11:23 PM

i dont even want to think about what's under my car...even with the virgin rear disc brake beam...

MyzticZ3r0

02-18-2013, 04:16 AM

I just realized that it has been a year since I undercoated it. Since Crashy and my 09 are in opposite spots in the garage in preparation for the impending blizzard, I put the 09 on the lift to see how the Herculiner is surviving. Not a bit has flaked off, even with the wicked road salt around here.

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I applied the herculiner undercoating today to my wheel wells! I couldn't apply a second coat due to time constraints and being called into work :( I figured a little dust couldn't hurt and I'll just apply the second coat tomorrow or Wed. Did you do the entire floor pan of your Yaris? I'll try to do the floor pan by next Sunday hopefully. I learned today to buy a paint projector respirator - this stuff made me dizzy and lasted until the middle of my shift tonight >.>

CTScott

02-18-2013, 07:34 AM

I applied the herculiner undercoating today to my wheel wells! I couldn't apply a second coat due to time constraints and being called into work :( I figured a little dust couldn't hurt and I'll just apply the second coat tomorrow or Wed. Did you do the entire floor pan of your Yaris? I'll try to do the floor pan by next Sunday hopefully. I learned today to buy a paint projector respirator - this stuff made me dizzy and lasted until the middle of my shift tonight >.>

I did do the entire floor pan, and on Crashy2, when I had her gas tank down (to weld the inserts to the floor for the 60/40 rear seat conversion) I even did the area above where the gas tank sits.

You definitely want a good chemical, as opposed to dust, respirator, as the fumes are really bad for you to breathe.

MyzticZ3r0

02-18-2013, 05:40 PM

I did do the entire floor pan, and on Crashy2, when I had her gas tank down (to weld the inserts to the floor for the 60/40 rear seat conversion) I even did the area above where the gas tank sits.

You definitely want a good chemical, as opposed to dust, respirator, as the fumes are really bad for you to breathe.

I swung by home depot for a professional respirator this morning - I'll be up close and personal underneath my car this coming weekend. I didn't notice too much of a difference today while driving my car. I think adding the second coat to the wheel wells and starting the floor pan will be noticeably different *crosses fingers*

MickZEL

02-19-2013, 04:03 PM

How well this structure keeps on metal?
Whether will be with corrosion time under it?

CTScott

02-19-2013, 04:06 PM

How well this structure keeps on metal?
Whether will be with corrosion time under it?

It bonds very well to the painted metal. It is made for coating the bed of a truck to protect the paint and prevent corrosion from abrasion.

MickZEL

02-19-2013, 04:27 PM

The body should be washed from a dust before drawing?

CTScott

02-19-2013, 05:07 PM

The body should be washed from a dust before drawing?

Yes. Washed very well to remove any dirt, salt and oils and dried completely before applying.

yougojay

04-18-2013, 04:35 PM

CTScott

04-18-2013, 05:37 PM

This is a great idea - I thought about getting some kind of undercoating to do the rear wheel wells as part of them were missed (bare metal) from the factory.

Autozone has a smaller 2.5 pound can of the same stuff for $29.99, in case folks want a smaller can to do just the wheel wells. Will give it a go one day and try a 2'' or 3'' throw-away brush. - Again, this is a great idea, thanks Scott

The little can is probably enough to do a couple of coats on the wheel wells and a full single coat of the bottom. Just make sure you either apply it outside or wear a respirator. The fumes during application are nasty and dangerous.

Mittelklasse

04-21-2013, 10:40 AM

I did this using roof asphalt coating paint. I only painted the half of the wheel wells that is on the passenger cabin side (the car was undercoated from the dealer).

I also attached patches of rubber insulation foam before coating.

It doesn't reduce the road noise that much, but it does noticeably shift the noise's frequency lower.
I also have done soundproofing using weatherstrip rubber on the B-pillars, and rubber insulation foam in the cavities in front of the doors, and underside of the doors.
The noise became less irritating and I can have a conversation in car clearly up to 80 MPH -- where wind noise is starting to have more effect.