Sikaflex vs bostik

[rib]

Happy Xmas everybody. I'm having my teak decks replaced with the option of using sikaflex 290 and 298 or bostik msr dc and msr bc any views /experience. Work is being done by a yard and they have given me a choice. Many thanks

 

[SvenH]

If I were doing a job like this I would only offer a choice like this only if I could guarantee both options without any reservations.
And I do not think that there would be a big difference in price, if any?

I did my own deck with cork with bostik which was supplied by the manufacturer of the cork so they did not mind offering it for this job!

Not a complete answer but it may help

 

[BabaYaga]

with the option of using sikaflex 290 and 298 or bostik msr dc and msr bc any views /experience.

One is polyurethane based, the other a silyl modified polymer. I guess a degree in chemistry might be required in order to figure out if and why one is better than the other...
Another consideration: There will come a time, hopefully in the distant future, when you or the next owner will have make to repairs to the deck. It could be quite a nuisance if the product/manufacturer were no longer around at that date, as it can not be taken for granted that a repair with a different chemistry will bond with the original caulking.
On my own deck, relaid in 2008, I have a silicone based caulking, of a type that for a long time was used by the local boat building industry, for instance by Hallberg Rassy. But some time ago the manufacturer, Henkel, took this out of production. Just recently though, it seems like HR have managed to source a replacement. incidentally it is manufactured by Bostik/Simson. I haven't seen this at any chandlers, but it is sold by the HR web shop (the S is for silicone):
Teak Deck Caulking - Bostik MSR Deck Caulk S

 

[MikeCC]

Modified polymer products have these advantages:
- no primer required
- good UV resistance
- no solvents or isocyanates
- wide temperature range performance
- better product shelf life

The silyl component does not leave a permanent residue like a silicone product.

In terms of future compatibility, one would think that any chemically equivalent product would be fine.

 

[BabaYaga]

Modified polymer products have these advantages:
- no primer required

I think you will find primer is required, according to the instructions from Bostik/Simson.
https://www.bostik.com/globalassets...a-sheet/tds_en---simson-msr-dc-advanced-4.pdf

 

[MikeCC]

I think you will find primer is required, according to the instructions from Bostik/Simson.
https://www.bostik.com/globalassets...a-sheet/tds_en---simson-msr-dc-advanced-4.pdf

Thanks, was being a bit general on that aspect. Makes sense on teak.