As I get closer to getting my fiberglass bodied car ready for paint, I'm trying some new products that I really like. One of those is Evercoat Superbuild polyester primer. It basically sprayable body filler. I've used it on parts where a lot of body work was needed, as a final surface to block, before applying the final primer. The stuff sands easily, even when 3-4 coats are applied.

Evercoat Super Build 4:1

Evercoat Featherfill is also a high build polyester primer, but it's build thickness is a not nearly as thick and it tends to be a bit gummy to sand, even 15 hours after application. I have to use something like 150 grit, just to knock off some of the orange peel, before using 180 or 220 grit (dry).

Evercoat Feather Fill G2 Polyester Primer Surfacer - Gallon

The good thing about both products is that more filler or glazing putty can be applied directly over the primer, if needed, since they have the same polyester chemistry as polyester filler.

Speaking of filler and glazing putty, I really like two U-pol products that I've just tried recently. U-pol featherweight filler and liquid gold glaze both spread easily, cure fast and sand easily. The glaze is really great for making small repairs and filling pinholes. I wish I'd tried both products long ago.

U-Pol UP0745 Flyweight Gold Lightweight Body Filler

U-Pol Liquid Gold Pourable Glazing Putty