Polyurethane glues - How much do they foam outwards by?
Hi Gents,
It's probably a difficult property to quantify, but I'm curious as to just how much upwards - or outwards - a typical polyurethane adhesive will actually foam when setting? :?
Selley's, for example, claim that their "Durabond" has "gap-filling" properties. I don't know what the stuff is like on a vertical surface, but for whatever coating-thickness can be reliably achieved on a vertical surface before serious "running" occurs, how much will the stuff typically puff outwards by?
And also, if both surfaces are coated with it before they are brought together, will the stuff behave like a Contact-adhesive? (This should effectively double its gap-filling capability...)
For what it's worth, the application I have in mind is the fixing of some VJ-look MDF panelling to some wall-studs that are no longer exactly straight. Some of the studs are "high" and "low" relative to each other, and "curving" inwards and outwards into the bargain (which makes simple "packing" of their front faces a bit of a pain...:-)
Methinks some type of foaming adhesive would be a good way to go, but it would have to be able to do a decent amount of gap-bridging for its part. As you can imagine, the MDF sheets aren't all that interested in flexing in and out to suit the studs...:D
Some opinions regarding which of the polyurethanes are nice and thick (so as to limit the amount they will "run" on a vertical surface) would also be very handy, as well as any suggestions regarding other types of foaming adhesive that might be suitable for the job.
Many Thanks,
Batpig.