Putting this out there for whoever needs it in the future - if you are using Gear Aid Seam Grip and need something it won't stick to so you can, for instance, press the seam flat while it dries without having it stick to your pressing tool: baking parchment paper. Why? No idea! But after wax paper and polypropelene sheets both kind of failed me, I decided I'd give it a try on a small section and it was great.