Sealing Camper Trailer

Sikaflex from Supercheapauto firms like windscreen sealant....it would be the best choice IMHO

Thanks for your advice.

Just to clarify I understand I need a sealant with polyeurathane and can choose from brands of either:

PolyU (also known as Bostic Poly U)
Sicaflex
Parfix, or

and of these you suggest Parfix or Bostic Poly U ?

Cheers and thansk

The Bostic Polyeurathane is..from memory sold under the brand " Bostic Gold".

All the usual suspects, like Selleys also market a polyU sealer these days.

Read the tube, if it is a polyeurathane sealer it will say so on the tube.

Sica, without doubt are one of the top polyU sealer brands and the make a range of PolyU sealers ranging from a fairly basic construction industry sealer up to some very high spec quite expensive sealers for marine & automotive industries.
In the past they only made high end sealers....be aware these days they market a full range of sealers right down to ya "no more gaps" style acrilic painters sealers

So read the tube and make sure you know what you are buying.

For ya trailer, a basic construction grade polyU sealer should be adequate...particularly if you are going to paint over it.

If it is going to be permanently weather exposed or used in ya bathroom and not painted over, best to spend up and go with the marine grade Sicaflex.
It resists the weather and UV better and does not go mouldy any where near as fast as nearly anything else.

OH.
two things with Poly U sealers.....

They are a quite a lot stiffer than most other sealers, SO cheap cauking gins will not do....ya need a good strong frame and trigger assembly.....I've had good results with the yellow frame dripless guns.

Poly U sealer goes off far more surely than silicon even in the tube......SO
Get ya job worked out and plan to do as much of the job as you can in one go.
If you have sealer left in the gun....seal the end up as well as you can....stuffing a screw down the end is just not good enough.
Sealing up and storing in the fridge delays the tube going off

BUT once open, a tube of this stuff will go off sure as eggs.

A good reason to only buy fresh stuff from a high turnover supplier.

hope this helps.

cheers

Thanks for the great advice

Just to add to Bantams good advise.

Make sure you substrate is clean/clean/clean, because no product will stick to dirt/oil or flacking surfaces. Clean with turps or white spirit and let it dry. One thing with any poly urethane products is they can be messy and get everywhere. Make sure you have some turps and rags to clean up. A small paint scraper and an old kitchen knife are good to shape and clean the poly on the join.
Just mask either side of the join and make sure you don't leave a thick edge of urethane on the masking.You can pull the tape off before the poly has cured, or let it set and then peel the tape off.

Sikaflex 11FC is good but expensive.

Thanks

The trailer has been painted on the inside so the sealant will be applied to paint at the joins.

I assume Turps or white spirits will not affect paint or should I use something else?


Thanks

White spirit will not affect the paint. Turps may if it is oil based paint.

You may be able to test the turps in an inconspicuous place.

White spirit is almost identical to turps but less oily.

If turps will effect your paint white spirit most certianly will.

White spirit is not metholated spirit.

White spirit is a clean white mineral solvent and very close to the base of petrol and a variety of other mineral products.

metholated spirit is alcahol.

The big advantage of white spirit is that it evaporates cleanly leaving no residue.

cheers

Bantam is probably right about the white spirit. In practise the spirit used in moderation evaporates that quickly that it doesn't affect the surface. I should have stated that. Have used it numerous times with no problems.

As said do a little test.