Please could you advise what is the best sealant for rebedding the roof vent on a gel coated fibreglass roof(Autotrail)
thankyou
thankyou
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Depends on what you want...Please could you advise what is the best sealant for rebedding the roof vent on a gel coated fibreglass roof(Autotrail)
thankyou
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........ and enables removal if it needs to be replaced in future.Any Non setting mastic.. tube or roll
.. Carafax IDL 99 or W4 mastic on a roll
Non setting mastic allows the window to get a good seal and allows for the differential expansion of the window frame and the roof on hot days without breaking the seal. .
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indeed.......... and enables removal if it needs to be replaced in future.
Depends on what you want...
If its to be a permanent bond then the pu range of adhesives is ok..
I tend to go with the non setting mastics for sealing the roof lights and the likes...
Something like hodgsons seam sealant..
Andy.
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I dont think thats the issue with the pu adhesives...Thank you everyone for your answers.
Guess I will go for the Sikaflex 221 as it is available locally, I did consider the Puraflex which seems less expensive but just wondering if its the the old addage "You get what you pay for"
Thanks again
Thank you everyone for your answers.
Guess I will go for the Sikaflex 221 as it is available locally, I did consider the Puraflex which seems less expensive but just wondering if its the the old addage "You get what you pay for"
Thanks again
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Assuming you mean Sikaflex PU adhesive it isn't. It really isn't .Sikafkex or any similar product is easily cut through with a sharp blade without damaging the roof.
Assuming you mean Sikaflex PU adhesive it isn't. It really isn't .
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I agree about it being a personal choice. However the Sikaflex product you describe is a superb adhesive and can only be removed by mechanical means (no solvent works) with the attendant risk of damage to the two components involved. You are correct in that it is possible to remove it without damage if great care is taken. On the other hand a butyl mastic, in whatever form, is very easy to remove and the remnants are soluble in White Spirit. Butyl mastic is non-setting and apart from the inclusion of dirt around the edges could be re-used (in terms of it's ability to seal) after many years in place. The strip form is exceptionally clean and easy to use and is as good at sealing as PU adhesive.Sikaflex 512 Caravan Adhesive & Sealant for Caravans, Motor Homes & Trailers
Its just matter of opinion. I used this on the second occasion I had to remove a roof light. I cut through the joint with a craft knife, removed the roof light then took off the remaining Sikaflex by some sanding but mostly with a chisel, it came off without much difficulty. Of course refitting the same roof light may have been more difficult as removal if the Skaflex from the groove would not be so easy but that was not my intention. However removal of a damaged roof light and fitting a new one was not a problem and I would use Sikaflex 512 again.
I did quite a lot of thinking and research about this beforeI decided to use Sikaflex and from its great product and I am satisfied that the joint/seal is as good as new two years, and some very hot/cold weather later.
What works for one person may not for another. As I have said was one person thinks is correct may not be the same as what another thinks and in the end its personal choice.
I agree about it being a personal choice. However the Sikaflex product you describe is a superb adhesive and can only be removed by mechanical means (no solvent works) with the attendant risk of damage to the two components involved. You are correct in that it is possible to remove it without damage if great care is taken. On the other hand a butyl mastic, in whatever form, is very easy to remove and the remnants are soluble in White Spirit. Butyl mastic is non-setting and apart from the inclusion of dirt around the edges could be re-used (in terms of it's ability to seal) after many years in place. The strip form is exceptionally clean and easy to use and is as good at sealing as PU adhesive.