Adding a vent to a fiberglass topper/shell roof?

[Scott B.]

30 years in construction and messing around with sailboats.
I have removed far too much silicone used inappropriately. Silicone sticks well to stone, tile, grout etc. Contrary to popular belief it does not stick permanently to gel coat on fiberglass . It makes a great gasket material. The worst deal with silicone is once it fails it mast be removed completely mechanically then chemically before a repair can be done. Nothing sticks to silicone. Some like it I am not one of them, my experience you may feel different.
4200 is not as easy to separate as silicone but it does not need to be completely removed before a reapplication. Note 4200 and 5200 does not work with all plastics.
My point is use the right sealer for the right job, hope this helps,
Joe.

Fair enough. Thank you for the explanation.

I think I will do a little research on sealers - appears I may need to learn something...

 

[Mike S]

I added a vent to my ARE shell. I used a 6" 12V marine bilge fan and topped it with a clam shell vent cover. Took about 45 minutes once I convinced myself to cut a hole in the shell.