Well the thick stuff as you say is epoxy mastic 121 from rust.co.uk its for chassis parts etc , as for body work I have been using there epoxy 421lechlar for bodywork use
if you want the thick mastic type stuff the rust site sells look at jotun jotamastic , its VERY similar if you get me
not bad when u think then 30 quid for 2litre if mixed 50 -50
Best place to get spray tins of epoxy? the eastwood stuff looks good £17 a tin
the guy is saying he cant afford all the gear at the moment