Resins for the clueless
So. You have done a little research at the ol' Youtube University, and you are thinking about starting some kind of composites project. ONE CATCH! You just realized that actually you have no idea what you are doing. Your precious youtube videos did a great job of explaining the minutiae of the higher level subtleties in sanding technique or fabric choices, but then you never got any foundational education about the very basics. Good thing I'm here. Let's get beyond basic on resin. The resin is the sticky stuff that hardens and holds the fabric in place. It is the glue. There are tons of types of resins, but there are two main families: epoxy and polyester. (There's vinylester too, and I don't even know how UV cure resins work, but this is supposed to be beyond basic, so the esters are all getting grouped together and everything else is getting ignored. Plus I don't actually know all that much.) When people talk about gel coat, they are talking about a polyester