PU40 vs Sikaflex 291 vs Tiger Seal?

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Alantoo

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Apart from the difference in price are all the polyurethane sealers similar in use / quality / longevity?

Can anybody point towards any comparison/test sites?

I have seen various unsubstantiated claims that Sikaflex is much better than Tiger Seal, and equally that Tiger Seal is way better than Sikaflex :confused:

Then again most people here and on other forums just refer to Sikaflex with no identifying number which is extremely helpful :rolleyes: The general purpose polyurethane adhesive sealant is Sikaflex 291 I presume?

PU40 from Toolstation would appear to be the best bet price wise.

Anybody got a definitive answer?
 
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discool said:
Have u not thought of looking a the sealant trade suppliers, of looking at the manufactures specification sheets.
Everbuild Puraflex 40 / PU 40
Sikaflex 221 Adhesive & Sealant 300ml
If you interest in the products price, again look a the sealant suppliers sites not only Toolstation.
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Yes I did look at the specification sheets that I could find, but could not find a clear difference between them, they all appeared to do the same job, hence my post.

Toolstation just came up with the best price when I followed somebody's recommendation for PU40.

I did look at the links you posted, thank you, but I could not draw any conclusions from those either! They all "stick to most substrates", are "resistant to chemical attack" and "retain a flexible seal".

I am just thinking in terms of sealing sunroofs and sticking body panels and trim back on, and so it does not look like there is anything better than PU sealers whichever brand you go for.

Alan
 
discool said:
Just a small tube of PU sealant that Halfords sell will do a sunroofs or windscreen.

U can seal 20 sunroofs with a large tube of Silkaflex.
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I must have done something wrong in that case! I have just sealed my (two) sunroofs and done the vertical seam at the back and the plastic arch trim to inner wing of the offside front wing and I used most of one tube....the sunroofs were out and all the old sealer removed and a 8mm bead put all round, rather than just running along the flange which is what you were referring to I guess.:)

Mind you judging by the lack of original sealer that Land Rover had used they probably managed to seal many more than twenty from one tube:). That spec was only surpassed by the fact that the drongo that sealed in the plastic cups at the front of the sunroof sump tray missed two of the vertical joints altogether!
Alan
 
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Sikaflex 221 and the like are professional adhesives/sealers, the 'consumer' products like Tiger Seal are mainly used by one man businesses and the general public.

We use two professional sealers, Sikaflex 221 and Parabond 600. Both are very good, last very well and I would recommend either.

Our trailer floor is stuck down with Parabond 600 underneath and sealed on top with Sikaflex 221.

DBChassis30.jpg


There are no mechanical fasteners in that floor, it is all held by those two adhesives, and the final finished trailer has little in the way of fastners holding the cant rails onto the sides, it is all stuck down.

Parabond 600 is a truck body builder's adhesive/sealer.

We used Sikaflex 221 for our D2 sunroofs, only used a tube or less for both roofs, I remember buying two and having some in the gun and a full tube left over.

Peter
 
The Everbuild PU40 that Toolstation sell is a very versatile sealant/adhesive. It seems more resistant to movement that similar polymer products. Unfortunately, Toolstation only sell it in white, but at £3.90 a tube its a very cheap high performance sealant/adhesive.
I know you've already done the job, but the best thing for sunroofs is windscreen adhesive. Just nip down to your nearest windscreen fitters and they will sell you a tube.
 
We use an MS polymer sealer by Indasa on the old porsches we restore, as that doesn't shrink when it dries like a pu sealer does. That said it probably doesn't matter for what your using it for, but It distorts the body skin on the cars.
The only area I would be concerned with is UV breaking down the sealer on the glass if it has no uv primer?
For high strength bonding we use 3M structural 2pack bonding, its got very high tear strength, and has many manufacturer approvals, the only problem with that is you have to have the applicator gun!
 
Another vote for Sikaflex. I used it ona variety of jobs on yachts, in my opinion the best you can buy.
 
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