I am about to start on my WD12 kit. I was reading that when gluing the joints the epoxy needs to be mixed with silica powder to a mustard consistency. Then you use some fiberglass tape over the joints. I assume this is a two step process and the epoxy used with the fiberglass is a second batch, this time no silica. That makes sense to me, but, first time so I need to ask the basic questions.