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  1. #21
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    Default Re: Sikaflex alternative for sealing caravan

    Quote Originally Posted by Henris View Post
    Wurth has an equivalent that doesn't need to be finished. You dispense as you need it.
    To comment on a common myth, here my findings:

    I used Sikaflex (black) in February 2020 in my holiday place then wasn't there in close to 10 months.
    I used the remainder of the cartridge this year in January and it was perfectly okay.

    What I did was removing the nozzle and putting a plastic (like a piece of a shopping bag) in between the open end of the cartridge and the nozzle and screw it back on.
    When reopening, remove the plastic and push the now cured content of the nozzle out with a screwdriver then you can even re-use the same nozzle.
    Easy done as the cured Sikaflex is now solid enough not to break up in the process.
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  3. #22
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    Default Re: Sikaflex alternative for sealing caravan

    Quote Originally Posted by Rowan View Post
    Can this Soudaflex be used on yacht deck fittings?
    Butyl tape is apparently one of the best sealants for deck fittings, it never hardens so can remain water tight for decades and also tolerate a larger degree of movement than sealants that cure.

    For the same reason it's also very easy to remove if you need to take the fitting off, which is often no minor job with curing sealants.

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  5. #23
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    Default Re: Sikaflex alternative for sealing caravan

    Quote Originally Posted by hbannink View Post
    Soudaflex - same as sika just more economical. NEVER use silicone, acetic acid chows alu or any metal for that matter even stainless
    AND just to add - Try removing old silicone gel.
    Good luck with that.
    I have it all over my VERY old canopy and above my windscreen and they both leak like a sieve - especially the canopy !
    If it rains - put everything outside !!

    Joke, but ja.

    So maybe I should try the Sika, BUT how the H to get rid of years of silicon jell ?
    Believe me, I have tried.
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  6. #24
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    Default Re: Sikaflex alternative for sealing caravan

    Quote Originally Posted by Peter1949 View Post
    AND just to add - Try removing old silicone gel.
    Good luck with that.
    I have it all over my VERY old canopy and above my windscreen and they both leak like a sieve - especially the canopy !
    If it rains - put everything outside !!

    Joke, but ja.

    So maybe I should try the Sika, BUT how the H to get rid of years of silicon jell ?
    Believe me, I have tried.
    The method I've used to successfully remove silicone sealant from an surface is a wire brush on a drill and then scotch-brite to finish off. Before I do any replacement of sealant I always clean the area with acetone and then use Sikaflex.
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  7. #25
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    Default Re: Sikaflex alternative for sealing caravan

    The FC part in Sikaflex 11FC stands for fast cure. Polyurethane can takenages to cure, normal Sikalflex, Soudel end the Den Braven products cures at a rate of 3mm per 24hrs(afair). FC cures faster, not superglue quick but a few hours if memory serves. Sika is the more expensive brand.

    An alternative to use is a neutral curing silicone. I use Den Braven SilconNo often and am happy with the results.

    Polyurethane is a female dog to work with and her evil twin to clean. Silicone is way easier to work with and clean.

    I use acetone to clean surfaces properly before applying and good old masking tape to ensure a neat finish.

    Easiest way to clean old silicone is with a new carpet knife blade. You want a close cut to the surface as possible - but not recommended on painted surfaces like vehicles.
    Last edited by thabogrobler; 2021/04/09 at 08:47 PM.
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  9. #26
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    Default Re: Sikaflex alternative for sealing caravan

    Product called simpson, just as good as sikaflex!

  10. #27
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    Default Re: Sikaflex alternative for sealing caravan

    Quote Originally Posted by thabogrobler View Post
    The FC part in Sikaflex 11FC stands for fast cure. Polyurethane can takenages to cure, normal Sikalflex, Soudel end the Den Braven products cures at a rate of 3mm per 24hrs(afair). FC cures faster, not superglue quick but a few hours if memory serves. Sika is the more expensive brand.

    An alternative to use is a neutral curing silicone. I use Den Braven SilconNo often and am happy with the results.

    Polyurethane is a female dog to work with and her evil twin to clean. Silicone is way easier to work with and clean.

    I use acetone to clean surfaces properly before applying and good old masking tape to ensure a neat finish.

    Easiest way to clean old silicone is with a new carpet knife blade. You want a close cut to the surface as possible - but not recommended on painted surfaces like vehicles.
    and I thought You used window putty
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  11. #28
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    Default Re: Sikaflex alternative for sealing caravan

    Would it not be better to ask the company that is going to do the resealing what the best would be for a temporary seal.

    something that will not react with the seal they are going to use. Most if not all posts have been spot on so far.
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  12. #29
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    Default Re: Sikaflex alternative for sealing caravan

    Quote Originally Posted by IcePick88 View Post
    Hi guys,

    I need to reseal a small bit of my caravan. I did some sealing yonks ago and it needs some touch ups. But for the life of me I cannot remember what I bought. I'm sure it was sikaflex, but my local builders only has Sikaflex 11FC and I'm not sure if I can use it.

    Are there any other alternatives?

    This is just a patch job for now for going camping at the end of April. I would like to take the caravan in for a pro job after that to have the whole van resealed properly.

    I know I should not use normal silicone.

    ....

    so much chemical technology for such a little problem



    Just clean the area well with benzine or something ,get some fresh Prestik ( you can even colour-code it with some chalk dust) and plug the gaps you need to -it will do the job.

    Use the saved cash, clean hands, and time saved- to buy beer and drink it while admiring your smart, practical ,and temporary solution!
    Last edited by Patrick L; 2021/04/09 at 09:38 PM.
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  14. #30
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    Default Re: Sikaflex alternative for sealing caravan

    Quote Originally Posted by IcePick88 View Post
    Heard that normal silicone eats away at the alu. I guess 4 days won't hurt. I could always just remove it when I get home.

    I was quoted R5500 to reseal the whole van. Not bad.
    It's the Acetic Acid that does that, the best way to tell is if it smells like vinegar, don't use it.
    A normal Non-Acetic RTV Silicone will be fine, but the Sika and Soudal stuff is the best quality.
    RTV = Room Temperature Vulcanising.
    Cheers,
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  15. #31
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    Default Re: Sikaflex alternative for sealing caravan

    If using black, or any colour, don't use your bare hands to flatten. Question: what do you use to clean hands etc? Tried from petrol to paraffin, soaps and water. Tough stuff. Ended with scotch guard

  16. #32
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    Default Re: Sikaflex alternative for sealing caravan

    I dont know if you can get it down there but Tec7 is brilliant for sealing caravans (or anything for that matter). Ive used it to seal holes in the roof of my caravan that I drilled to route wires through and it has never leaked.

    Ive even seen it to keep a river out of a house! We had floods here a few years back. My neighbour sealed his doors shut with Tec7. When the river burst its banks, it was flowing around the house but never got in.

  17. #33
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    Default Re: Sikaflex alternative for sealing caravan

    Quote Originally Posted by Robbief View Post
    and I thought You used window putty
    Ja well, different products for different applications!

    I found superglue works wonders for a noisy wife!
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  18. #34
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    Default Re: Sikaflex alternative for sealing caravan

    Quote Originally Posted by Peter1949 View Post
    AND just to add - Try removing old silicone gel.
    Good luck with that.
    I have it all over my VERY old canopy and above my windscreen and they both leak like a sieve - especially the canopy !
    If it rains - put everything outside !!

    Joke, but ja.

    So maybe I should try the Sika, BUT how the H to get rid of years of silicon jell ?
    Believe me, I have tried.
    Peter I have had reasonable results with acetone, does nothing to powder coating but........test a small inconspicuous area
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  19. #35
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    Default Re: Sikaflex alternative for sealing caravan

    How to remove that silicone and sika.

    https://www.youtube.com/watch?v=yAa_...26EInTheGarage
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  21. #36
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    Default Re: Sikaflex alternative for sealing caravan

    Quote Originally Posted by Peter1949 View Post
    AND just to add - Try removing old silicone gel.
    Good luck with that.
    I have it all over my VERY old canopy and above my windscreen and they both leak like a sieve - especially the canopy !
    If it rains - put everything outside !!

    Joke, but ja.

    So maybe I should try the Sika, BUT how the H to get rid of years of silicon jell ?
    Believe me, I have tried.
    https://diy.bostik.com/en-ZA/product...icone-stripper

    I've not actually used it before, but there is something out there.
    Cheers,
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  22. #37
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    Default Re: Sikaflex alternative for sealing caravan

    Quote Originally Posted by IcePick88 View Post
    Heard that normal silicone eats away at the alu. I guess 4 days won't hurt. I could always just remove it when I get home.

    I was quoted R5500 to reseal the whole van. Not bad.
    I agree that you can use Soudal grey or white PU mastic ,grey is available easier ,second choice is the adhesives , bostik sticks like sh*t [evo stick] or Den Braven tectane. all are paintable. Using silicone will give you problems when you need to paint over,unless you can remove every bit.

  23. #38
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    Default Re: Sikaflex alternative for sealing caravan

    I got the Soudal white and applied this weekend after cleaning out all the other crap.

    Looks good and will hold until I take the van in for the job.

    Thanks all for the quick replies.
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  24. #39
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    Default Re: Sikaflex alternative for sealing caravan

    K
    Quote Originally Posted by stephenplumb View Post
    I know that the marines sikaflex can only be had around Dbn. I tried calling locally as they HO is up here, but they could only sell me a full box of many more tubes than i needed.

    Speak to them and ask them who has stock of the product you need, or if it is a temp job, just bodge it with some bathroom silicone and get the guys to do it when they strip and reseal.

    For boats, people seem to swear by Sikaflex, so it seems better than the competing products based on user experience?

  25. #40
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    Default Re: Sikaflex alternative for sealing caravan

    Why don't you phone the Pinetown branch of Sika and speak to their technical guru on sealants. They supply a poly sealant to the coach building industry and panel and not rivited to the body but glued on with their product .

    There is also a product that has come on the market called "Sticks like ####". Believe me it really does that and I think its the retain version of the industrial product sold to coach builders.

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