Best sealant for window (5 Viewers)

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Aug 29, 2019
210
88
Somerset, near Wincanton
Funster No
63,664
MH
Mirage 5000 A Class
Exp
Since 2019
Been getting a drip occasionally in heavy rain from side window. I suspect the sealant at the top of the window has failed.

We are off to Ireland on Friday and looking for recommendations for best sealant for the job.

TIA
 

HKF

LIFE MEMBER
Jul 18, 2021
2,960
5,709
The Charente, France
Funster No
82,778
MH
Benimar Europe 740
Exp
Since August 2021
Sikaflex gets a lot of mentions, although I'm not personally qualified enough to say just how good or appropriate it is.
 
Jul 28, 2008
860
815
Wiltshire, UK
Funster No
3,483
MH
Ducato Sportivo
Exp
Since 2005! 2000+ nights so far...
Not sikaflex or a PU - thats often shouted about, as does silicone, but goes solid/dry/cracks (and it needs to move due to different expansion between metal/plastic) - and cracks/leaks. silicone comes off with swearing. PU/Sikaflex comes off eventually with lots of swearing and damage. (If sikaflex comes off easy, it probably didn't bond - as it does need primer which no one uses)

* Many sikaflex products out there, just most use whatever is at hand

You need non-setting mastic

My choice is Decaseal 8936. Google it, YT it.

It gets put on line normal silicone, juts do loads so it overflows and makes a mess. Unlike silicone it never dries and "dabs off" - so I use a credit card around the window edge to "cut" the excess. Then grab a ball of it and "dab it off" - literally it sticks to itself and comes off without leaving mark/residue. My "dab ball" is in the conservatory for 3y and its still malleable.
 

Two on Tour

LIFE MEMBER
Sep 16, 2016
10,839
56,161
Near the junction of the A14 and A1, Cambs
Funster No
45,145
MH
Elddis Autoquest 175
Exp
Since 2010
I have always used Sika SikaLastomer 710 which is a non-setting butyl sealant and is as sticky as hell so seals very well.
Used it again recently to reseal one of our roof vents that had been factory installed using silicone which had failed and to install a Maxxfan Deluxe.
 
Nov 4, 2011
6,372
44,137
Uk
Funster No
18,763
MH
A class
Exp
2001
I’ve just resealed one of my roof lights, I used this
 
Aug 24, 2023
45
84
Brixham, UK
Funster No
98,390
MH
Laika Kreos 3007
Exp
September 2023 :)
You could try CT1. This sealant will work in any weather, you can even seal a wet joint, even works under water.
They do a clear and white and, possibly, other colours too.
Have a look on their website.
Good luck (y)
 

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