One thing I became painfully aware of when walking in these home-made platform boots was that they were slippery. I had painted the bottoms of the insulation black with acrylic paint, but there was no grip at all...and I thought, "This is how accidents happen!" So I went to the local cheap housewares store and bought a rubber placemat.
I cut out sole shapes by tracing around the boots.
I squeezed out some "NO MORE NAILS" adhesive then smeared it evenly and as thinly as I could using a scrap of paper.
I pressed the rubber piece onto the bottom and wiped away the excess adhesive that oozed out. When It's dry, I'll touch up the white adhesive with more black acrylic paint.