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Old 07-05-2023, 08:54   #1
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Question re UV in caulk

I was about to caulk my leaking deck and realize my three tubes of Sika 291 LOT are not UV. Have you found significant longevity differences with uv labeled caulk? Ready to hit the brakes for today but would love experience based insight
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Old 07-05-2023, 09:17   #2
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Re: Question re UV in caulk

It does make a difference in coatings and other things. I imagine it will with your caulk. I've used 5200 in exposed places and it turned brittle and a bit crumbly within a couple of years.
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Old 07-05-2023, 10:13   #3
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Re: Question re UV in caulk

@Cheechako thank you for a reality check, will hunt locally for a better product tomorrow. Ironically I received a tube of 3m 4000 in the mail for this purpose on Friday and it was missing the removable tube which is now in the mail.
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Old 08-05-2023, 03:01   #4
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Re: Question re UV in caulk

There are caulks which are labeled "UV." I'm trying out the Petit one right now, but of course won't know how it holds up until a couple years have passed.
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Old 08-05-2023, 04:01   #5
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Re: Question re UV in caulk

I mainly use the 3M products as that's what is available locally. The 4000UV does hold up slightly better than 4200 etc. but honestly I don't think there's much in it. It still goes brittle, chalky and loses its bond in a few years. I would try to find something better for re-caulking a deck.
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Old 08-05-2023, 05:26   #6
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Re: Question re UV in caulk

Teak Deck Systems SIS 440. Polyurethanes are not the most UV-stable compounds, so you are hunting the wrong place.
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Old 08-05-2023, 18:28   #7
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Smile Re: Question re UV in caulk

Quote:
Originally Posted by maury View Post
I was about to caulk my leaking deck and realize my three tubes of Sika 291 LOT are not UV. Have you found significant longevity differences with uv labeled caulk? Ready to hit the brakes for today but would love experience based insight
Hi, how are u? I had some of my seams sealed with Sikaflex 291 and even worse...221! So after a few years some of my seams became dried and exposed the grp below and had some water leaks.

Since then, I have been using Sys 440 from Teak Deck Systems. it is very workable and have tons of UV protection! Very happy with that product and also it does not need a primer... In my case, due I am pretty far away from the US it needs to be shipped by airplane and Sys 440 has no fire hazard restrictions so it always arrives on time when needed...

Well, that was my recommendation and some work experiences...

So far, after 2 years, have not had any problem with the Sys 440

I hope this helps,
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