Using a clear coat on your headlights is important. It helps keep the plastic from yellowing or developing a fog over time. The reason it is important to prevent the fogging or yellowing is that it can make it so your headlights do not function fully. Also, once the breakdown of the plastic starts it is hard to reverse it.
How to Use Polyurethane Over Latex Paint
Quick Drying Sealers to Put Over Painted Floors | Home Guides | SF Gate
Quick Drying Sealers to Put Over Painted Floors
Instead, protect it by applying the absolute best clear coat for furniture. Have you ever spent hours refinishing a piece of furniture only to have the top ruined by a drinking glass ring or even a scratch? Have you added a protective finish to a furniture project only to realize it was a horrible product that ruined your finish? If you have, you know how incredibly frustrating that can be. I get it!
Polyurethane is a clear varnish that dries to a hard, solid finish. It protects your wooden surfaces from scratches and prevents paint from peeling, and it's easy to clean. These qualities make it ideal for finishing tabletops, bartops, cabinets and other indoor surfaces. Polyurethane can crack and bubble if it is exposed to too much sunlight, so it isn't suitable for outdoor surfaces.