Postby Hasbeen » 14 Dec 2008 23:55
Mac, the best thing to use is a urethane sealer/adhesive for these jobs.
If you wish to use silicone the trick is to just do the fasteners up finger tight for a few days, until the stuff has fully cured, then tighten the screws, so you are compressing the silicone, using it as a gasket. It is not reliable as an adhesive, & will normally leak, after a while.
A mate of mine builds "horse trucks". Trucks to transport up to 9 horses for racing & show stables. They are paneled with colour bond 1.5mm steel sheating, & the entire roof, & body are glued together & to the frame, with a urethane sealer/adhesive called Sikaflex [spelling]. These things have NO, I reppeat, NO fasteners at all.
The panels are held to the frame, & to each other just with urethane, & have no screws, rivets, or bolts, & he's been doing it for years. Frightens the daylights out of me, but it works.
They simply run a bead, place the panel, & compress the stuff, until some sqeeses out. In some areas its clamped over night, then the excess is trimmed the next day. It really works.
Hasbeen