Sorry, another question re silicon sealants

[aitchw]

Does anyone know what the major difference is between silicon sealants 'formulated' for marine use and say ones used for bathrooms or other wet environments?

 

[Medskipper]

Re: And could I just ask...............

What is the remover called? and where can I buy it?

Thanks

Barry

 

[Talbot]

personally prefer to use the adhesive sealant - Wurth make a good one that doesnt go off over a weekend like sikaflex.

 

[Gin]

Re: And could I just ask...............

http://www.screwfix.com/app/sfd/cat/cat.jsp?cId=A336165&ts=61804

 

[Gin]

The domestic stuff is not UV resistant and has an acid content ( a vinegar smell when ejected from the tube)

I think what you need is a neutral cure sealant which remains flexible, but beware of Sikaflex for whilst it sticks very well indeed it does not like to let go and it is a devil of job to remove items fixed with the stuff and indeed remove it from them

have a look at

http://www.screwfix.com/app/sfd/cat/cat.jsp?cId=A236073&ts=62004

 

[poter]

Re: Sorry, another question re silicon sealants

Ok the difinitive product for Marine sealants is
Sika Do a search for 'boats'!

Then download the marine handbook - excellent.

poter

 

[Medskipper]

Re: And could I just ask...............

Many Thanks

Barry

 

[aitchw]

Thanks for the suggestions, guys.

 

[dweeze]

[ QUOTE ]
and has an acid content ( a vinegar smell when ejected from the tube)

[/ QUOTE ]

The acidic smell you get when you put these products down is the silcate. Sikaflex, 3m etc are polyurethane base.

The difference between the two basically comes down to durability. Silicate based sealants break down quicker - whether thats because of the lack of adhesion you seem to get with them or the UV breakdown I dont know.

Through experience - I wont go near the boat with a silicate based product. The good stuff costs a heap more but it works.

 

[Hoolie]

But you can buy glazing sealant that doesn't smell of acetic acid. I presume it's also UV resistant since it's specified for external use. OK for boats?

 

[AndrewB]

I've used DIY exterior polyurethane sealant when pushed, but it doesn't work well, and soon needs replacing. Sikaflex and 3M 5200 marine adhesive sealants (and also non-adhesive marine sealants to return to the original question) are formulated to withstand a lot of flexing when cured, which I think is their secret. Sikaflex 291, the most popular, is only moderately UV resistant. For bedding in windows, prefer Sikaflex 295 which is highly UV resistant, but damned expensive.