How to cut 4' foam (perfectly) for cushion??
I know this sounds funny but I'm hoping some of you upholsterers will chime in.
I bought outdoor foam (expensive!) that is 4" thick. My seat cushion that I'm making curves and flares. I need to cut my foam perfectly so that it holds it's shape on the sides for my fabric to lay over nicely. I mean, I'm afraid that if it has hacked edges or if I compress the foam to cut it, maybe the sides will bulge therefore making me cut too much out of the sides. Does that make sense? I just want the "planes" of the cushion to be at 90 degree angles of each other.
I feel like taking a huge steak knife or saw blade and chiseling out the shape---but what is the proper way to do it?