I should take my own advice some time soon as I need to rake out some of the old sealant and reseal. I never like seeing adhesive on a product that I just want to seal with though lol. On my van the piece that covers from top of van cab curved over and joins the ali composite roof and walls I am not sure it should be bonded with a sealant/adhesive or just a sealant. I think the front bit is ABS or some flavour of plastic but all the joins on mine where it needs replacing it is more like silicone sealant you would use round a sink type stuff, makes a seal but little stick together ability it you get me.
I don’t know, I will ask which to use when I get round to doing it but have always wondered about it. Probably different expansion forces between the plastic and composite panels as well.I thought similar Neil but in the case of a cab to hab sealant I would imagine that there are quite strong forces working against it and although it's not there to hold the two together it will probably need quite a bit of strength which is why I though an adhesive/sealer may be better?