Originally Posted by Duchie
Oh yes , you should try and have a silicon layer of 50 mm wide by 5 mm thick , which allows for expansion and contraction , because it will !!!
What a timely thread.
Instead of leaving today, we removed the lens from the forward bowmar offshore hatch
. I can't tell if it's original - seems like it's not, as it's only 1/4", and it's acrylic (nice bunch of cracks which have progressed to leakers, and some concern for taking a wave and collapsing in pieces), the factory telling me that they use 3/8 polycarbonate, and there is what appears to be white caulk, instead of the expected black silicone (795, silpruf, others).
I'm aware of expansion/contraction, but I think my math has 50mm = almost 2" and 5mm about 1/5".
My aft slider used 1/8" spacers per suggestion of Tony, the hatch guru, and about 1/4 gutter/bevel outside. And that was 24x30 inches, no support bars, 3/8" (I forget if poly or acrylic; mostly likely acrylic cuz that's what he likes).
instructions are to lay a bead on all surfaces and float the lens into place. Once in place, make the outer ring sealant
, using an old spoon as a shaping tool (relatively wide radius, slightly concave when finished). Neither case has any suggestions involving that much expansion/contraction.
What surface/dimension do these numbers represent? It's a most timely discussion, as we've been delayed yet again with a gamestopper, on the eve (literally) of our departure after more than 2 years of such experiences (gamestopper just as we anchor
, or just before we leave).