stumbledin
+1y
Ive heard kitty hair and plastic filler mentioned to cover these with.
Kitty hair is so thick its very very hard to work with. regular plastic filler has no structural strength. Its best to use Dynaglass or someones ripoff. Napa has their version. Most auto paint stores have some knock off version. its best to cover any areas that need structure with dynaglass and really good to cover anything you make with fiberglass with it. You wont have to worry about shrinking and cracking down the road.
also, mixing resin you should not mix it hot, by that I mean dont use alot of hardener because this allows will make it crack as well. The heat and chemical reaction is what makes it get hard. You can mix it light then put it on and help it with a heat gun or hair dryer.
also, as a base material when making door panels.. Most people use some fiberboard or similar. These dont work well when putting screws in or plastic door panel clips. There is a very thin flexible wood product thats sold at Home Depot and Lowes called "door panel" its used as the cover for making doors or reskinning a door. its very thin, flexible and still has structure, plus being a wood with grain plastic filler, resin and dynaglass all stick to it very well