Head lights getting hazed from abrasion?

[06YarisRS]

I refinished mine using 1500 grit wet sanding followed by compounding with my dual action polisher. They came out good and clear, but I can already see slight yellowing occuring despite applying acrylic sealant - Klasse High Gloss Sealant Glaze - the most durable sealant I'm aware of and it has UV protection.

Here is a link to my attempt at refinishing them (about 1/2 way down the page).

http://www.yarisworld.com/forums/sho...ht=renovations

I am going to be painting my car soon and may clear coat the lights when I spray the clear. I'm not fully decided as several years back I had the headlights of a wagon I had sanded and cleared at a body shop. A few years after I sold it, I saw it in a parking lot and the clear coat was blistering off in big chunks. Maybe it was rushed through with inadequate prep, but maybe not.