Silicone sealant

[tetleys]

Which is the best white sealant to use when replacing mouldy sealant between panels on the deck and coachroof ?

Any thoughts much appreciated

cheers

Tetleys

 

[wipe_out]

Sikaflex is probably the most common choice..

 

[jfm]

I'd check whether you want silicone or polyurethane. Both can seal against water, but in the structural sense the former is just a cover "trim" layer and the latter is an adhesive. I'd use 3M 3200 for former and 3M 4200 for latter

 

[sarabande]

there may also be times when butyl tape is useful.

e.g.

http://www.ebay.co.uk/sch/i.html?_f....H0.Xbutyl+tape.TRS0&_nkw=butyl+tape&_sacat=0

It has the advantage that it does not go rock hard, and retains a bit of flexibility, so often used in caravans and motorvehicles where there is a a lot of vibration. Butyl tape is lot easier and cleaner to deploy than using Arbo mast from a sealant gun.

 

[simonfraser]

For the bath silicone
Sikkaflex for the boat, esp if it is external

 

[jfm]

For the bath silicone
Sikkaflex for the boat, esp if it is external

You're comparing apples v pears though. Silicone is a product type; Sika is a brand. Sika make several sealants, some silicone, some not. It's just a brand. You would be better choosing a product type first (silicone, polyurethane, blend (for caulking), superstrong polyurethane, butyl, etc) and only then worrying about the brand (ie Sika versus 3M versus Alpha, etc)