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Acording to the C.A.K. Tanks Ltd Catalogue which sells both, it says that 512 has very similar properties to 221, but has improved bond strenth and cure times. I have used 221 to bond new spars, polystyrene and the panels in my van and am very pleased with the result. They use 221 in the Haynes caravan manual to reseal awning rails and say that no screws are needed except for a couple just to hold it in place while it sets.

Dave

Instead of sikaflex have you thought of Fix All by Soudal? It is recomended by Swift caravans for all their maintenance and repair work. Find a link below and see what you think:

http://www.uksealants.co.uk/product.asp?idproduct=58

Alastair