If it hasn't already been mentioned, In many circles the seal you are describing is known as a 'form-in- place' seal. Working on military aircraft myself, we sometimes use tricks like wax paper, tape and even plastic wrap. More commonly, we use a spray-on Silicone Release Agent. Assures a perfectly formed seal, cleans up very easily with iso-propanol and won't interact with sealants.
My two cents worth, Don Greer Belleville, Ontario On 18-May-11, at 2:14 AM, Martin Pearce wrote: > " An additional step might be to place a very thin plastic like > "Glad cling > wrap or equivalent" or other no stick cover on the bottom half to > have the > silicone form a seal without binding." > > A smear of oil or grease on one side only will also do the trick > with no > risk of wrinkles ...... done that lots when making gaskets for the > hull to > fin joint on custom wood / fibreglass fins for my windsurfer ... > > Cheers > Martin
