W Wellshine Tumbler Shields for Epoxy Resin Paint, Flexible Foam Tumbler Protector for Epoxy Rims, Tumbler Paint Spray Shield, DIY Resin Epoxy Clean Cup Rim Accessories Work with 1/2 "PVC Tube - 5pcs

I love these I would love more for the skinny tumblers but these work great for curved tumblers

Don’t waste your money. It didn’t really fit in my cups. I bout it to protect my inside of the cup and it just adhered to it and left foam behind. Cheaply made

Works great. Keeps spray paint from getting inside your tumblers.

DO NOT BUY. Wasted money on this. They are taped together in short with either double sided tape or taky glue. Placed one on my cup placed it on the turner and before I could do anything it had come apart. If you want a project before you do your project then sure buy these and skip right to pulling them apart and using hot glue on them.

Not what I imagined. All were a bit larger than tumbler mouths. Thus allowing resin to get passed it. The ones that I could squeeze a fit with the resin stuck to the material and one I tore up trying to get it off.