Karl,
It's just a new delivery system(thickened unmixed West in a caulk tube). I used West system and fiberglass fibers to seat my beams. Just make sure you use a good mold release on your beams to pop them back out or you'll have the problems Mike is referring to.
I was just thinking it would be easier than me screwing up a ratio when mixing. I also thought that covering the bottom of the beam in vinyl like the graphics guys use would be an easy way to get things to pop apart later on. Then again it might not work.
Get the pumps that ratio the West system. They're cheap like $10 or $12. Makes it alot harder to screw up.One pump of resin equals 5parts to one pump of hardener which equals 1part.Then mix in your thickener of choice. No problem.
On some boats it takes quite a lot of resin to fill the voids between the hulls and the beams so using self-mixing tubes would get pricy. All it takes is some car wax on the aluminum - epoxy doesn't like to stick to aluminum well to begin with - and they release with a slight bang on the underside of the beam with your fist.
DO NOT use 5200 or other similar product to "seal" the beams. You want to seat them. The idea is to firm up the joint and keep them from moving. A flexible filler doesn't do this AND it will definitely be impossible to separate the two later.
