Sealing mushroom vents

[DJW]

I'm about to start repainting my boat and will taking the mushroom vents off to tackle some rust creeping underneath them.

 

When I come to put the mushroom vents back on what do I need to use to seal them to the roof? Presumably they don't just screw back on with nothing to keep the water out....?

 

Thanks

[the grinch]

a clean surface, free from grease or dirt, then 2 beads of silicone around the base before carefully placing, don't wipe the excess off let it dry and then carefully cut the excess off with a stanley/craft blade

thats how i've always done it, never had a leaker!!

[ditchcrawler]

a clean surface, free from grease or dirt, then 2 beads of silicone around the base before carefully placing, don't wipe the excess off let it dry and then carefully cut the excess off with a stanley/craft blade

thats how i've always done it, never had a leaker!!

I used the mastic as used for bedding caravan windows on. Like this

[nb Innisfree]

Also known as 'Arboseal' I think, available at some chandlers.

 

Also available in black.

Edited July 16, 2010 by nb Innisfree

[Gibbo]

Double sided, self adhesive, thick neoprene tape. Faultless. It's what the pros use.

[blackrose]

Marineflex http://www.marinemastics.com/marine-flex/m...x-one-tube.html

 

I use it for bedding in skin-fittings, windows, mushroom vents, etc. It can also be used to stick battens to steelwork as it's a structural adhesive.

 

It really is good stuff and I'd never be without a tube on the boat.

[DJW]

Great, plenty of options then! Thanks all. Now I just need to get painting

[PhilR]

Great, plenty of options then! Thanks all. Now I just need to get painting

 

Good luck with the repaint. I hope the weather is kind for you.

 

Have you checked whether all the screws/bolts on the mushroom vents are free and not rusted up?

I wish I had done so before starting my (still in progess) re-paint. It would have given me the chance

to use some penetrating oil in advance and have the right tools to hand............

 

Phil

(still waiting for that elusive 100% dry day to finish top coating)

[DJW]

That's a good point Phil, no I haven't!

 

I will definitely try to get them unscrewed now as some are looking a bit the worse for wear.

 

Thanks

[ChrisPy]

Last time I removed the mushrooms I put a bead of silicone round the base and only re-fitted the vents when the silicone had completely set. Hopefully I will get a good seal under compression, and the paint will be unaffected next time I remove the vents. Time will tell.