+x Hanaldo - 4/24/2020 12:26:21 AMFilleting wax is far superior to modelling clay, both in how nice it is to use as well as how well it works. Definitely do yourself a favour! For release agent, I do all my coats of chemical release agent before applying filleting wax or clay. Then I do a couple coats of release wax, which cleans up any residue in the process. You should also be fine to just lightly buff the residue off, but I do like to do another coat afterwards - you can never be too careful with release agent!