I am making a diorama at the moment which involves having a few muddy puddles. I am about to make them using Resin.
I'm using a product called Spakfilla, a type of wall plaster/filler as the groundwork base. As a preliminary test, I poured some water onto the base, but it was absorbed by the Spakfilla (which is a little porous). How should I prepare the base for these Resin puddles, i.e. what product/s should I use to seal the base before adding puddles? I don't want the resin to be absorbed into the groundwork and lost.
Look forward to some help.