Best sealant/mastic to use

[kevin707]

After some advice on what sealant I should use for external joints
The stuff used by manufacturer seems rubbish it cracks and discoloured in just a few months so thought I May replace it but not sure what is used or what I should use it mainly wher th panels join or around the door step etc

 

[I2C]

I’ve used Sikaflex 291 before, they have a variety of products suitable for use on a motorhome.

 

[Ray-Vic]

I used Sikaflex 522 recently to re-stick/seal one of the front lower skirts on our Bailey which had come loose and it appears really good. Has certainly stuck well that's for sure!

 

[RogerIvy]

Sikaflex 522 Is great stuff.

 

[the1andonly]

Sikaflex products normaly specify the use of an activator. Read data sheet before use.

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[bigtwin]

I used Sikaflex 522 recently to re-stick/seal one of the front lower skirts on our Bailey which had come loose and it appears really good. Has certainly stuck well that's for sure!

Sikaflex 522 Is great stuff.

522 is an adhesive, kevin707 is looking for a sealant.

Ian

 

[Ray-Vic]

522 is an adhesive, kevin707 is looking for a sealant.

Ian

On Sika's website they say it's a sealant/bond?

Sika 522

 

[EuroTrotters]

Sika is great, but sooooo confusing

What is wrong with ......

Sika 007 is great for bonding!
Sika 999 Emergency Duck tape Liquid
Sika 222 Water Proof and triple strength
Sika 69 .........


Just tell us what it does

 

[Ray-Vic]

Maybe they realised that, so with the 522 product made it very clear what it's for by saying on the package "adhesive sealant for motorhomes"?

 

[EuroTrotters]

Maybe they realised that, so with the 522 product made it very clear what it's for by saying on the package "adhesive sealant for motorhomes"?

View attachment 799446

I was just about to say, I saw that the other day.

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[TheBig1]

generally motorhome manufacturers use carafax or similar non setting mastic sealant. Replacing with urethane sealants such as sikaflex or puraflex leaves a far more permanent seal

 

[EuroTrotters]

generally motorhome manufacturers use carafax or similar non setting mastic sealant. Replacing with urethane sealants such as sikaflex or puraflex leaves a far more permanent seal

We mentioned this before, it just seems to wash away !

So, I just had to re-seal. Used Carafax (may be okay for caravans ) in the past. But just used some Sika FBT over the top as a temp measure

 

[RogerIvy]

522 is an adhesive, kevin707 is looking for a sealant.

Ian

I think enough comments have come through showing that it’s both.

 

[bigtwin]

I think enough comments have come through showing that it’s both.

Indeed, but that hasn’t been in doubt. If you’re looking for a mastic/sealant for joints (as the OP was) then an adhesive isn’t the right product.

If you’re looking to stick something then it’s a suitable product but if you want to ‘unstick’ something then you’re creating a problem for yourself by using an adhesive.

Ian