Hi, all- I'm building this using panels of closed cell foam (Divinycell) and I've managed to sandwich three layers (1/2" thick and 12" x 60" width x length) and I'm not using a vacuum bag- just placing two long board with lots of weight on top, all of this laying on my garage floor in lieu of using sand bags as demonstrated on the Jamestown distributors videos. Anyway, since plenty of epoxy squishes out along the sides, I laid wax paper down, thinking that would work to keep it from adhering to extraneous surfaces, and it kind of does, kind of doesn't. I checked on it about 4 hours into the cure (using West System's slow hardener) and it still sticks.
Question 1: would using Saran wrap work better? I've also heard about using hair spray, but I'd be worried about not doing a sufficient enough job getting all the hair spray off and preventing a good bond when I wrap this thing with more cloth and epoxy resin.
Question 2: thinking about tiller options. I'm wanting to use aluminum tubing, and reading this: Guide to Buying Aluminum Online | Online Metals Guide to Selecting Metals for Your Project
and here is where some selection comes in- I'm guessing that effective dimensions would be maybe 1/8" thick tubing, 1-3/4" outside diameter for a tiller that would be about 6 feet long, but I'd rather not just guess at this...
If anyone has any experience, especially with this last question, I'd certainly appreciate a little advice! This is for an Olson 30 (~3600 lb displacement), but my rudder is being designed more along the size of a J24 blade (which is approximately 3/4th the size of the Olson's).