#moldymonday rides again! No. 53, part 1

I'm going to do a few more editions of #moldymonday. I've acquired a few more molds to show you guys, and there were still a couple left from before that I never cast. For this first re-entry, I'm going to do a short series on how I prep a brand new mold. This is a NOS H&G #292. Never had been cast before!