Sikaflex?

[alant]

How flexible is it?
Can it be applied to a wet/damp surface?

 

[nickd]

should find all you want to know here
http://www.sika.com/en/solutions_pr...arine-market/marine/leisure-boats-yachts.html

 

[Greenheart]

...should...

Hmm. Hope it's that simple. Personally I went wrong several times before buying the correct variety of Sikaflex. I bought 291 when I needed 292, and the formulation has changed again since then, so it's worth checking that the variety suits your purpose.

 

[Minchsailor]

I am no great fan of Sikaflex - messy, difficult to disassmble, a half empty (expensive) tube goes hard.

Have a look at Arbomast for most sealing jobs - non-setting mastic, compatible with alloy, doesn't go off.

 

[SAMYL]

CT1 sticks to wet surfaces and will well outlast Sikaflex.

 

[vyv_cox]

CT1 sticks to wet surfaces and will will outlast Sikaflex.

Who says? I have some Sikaflex 291 on joints and sealing applications that is nearly 20 years old, still working fine. I doubt very much that CT1 has been invented that long.

 

[VicS]

Who says? I have some Sikaflex 291 on joints and sealing applications that is nearly 20 years old, still working fine. I doubt very much that CT1 has been invented that long.

I wonder sometimes just how much better these modern sealants are compared with the older ones.

I used this stuff originally for everything on my boat. Although most of the deck fittings were removed and refitted during the relining a few years ago the through hulls have remained undisturbed and watertight for fast approaching 40 years. What remains in the tube feels useable too!

 

[Greenheart]

Probably no great concern for most users, but I've noticed before and was unpleasantly reminded this evening, that any overflow of Sikaflex onto pale surrounding wood or painted surfaces, seems to attract ineradicable dirt.

I suspect the only way to shift the black staining around the ply/GRP join, is by scraping off the surplus Sikaflex, which risks also tugging out some of the portion which is there to waterproof the join.

 

[Slowtack]

Sikaflex is a poyurethane. I find it a good strong adhesive and sealant for joints that do not require to retain much flexibility. It requires a dry surface. Tec 7 is equally good imho. For long term flexibility and tolerance to movement I would generally use a polysulphide sealant.

 

[Kurrawong_Kid]

I wonder sometimes just how much better these modern sealants are compared with the older ones.

I used this stuff originally for everything on my boat. Although most of the deck fittings were removed and refitted during the relining a few years ago the through hulls have remained undisturbed and watertight for fast approaching 40 years. What remains in the tube feels useable too!
+1