5PCS Tumbler Shields for Epoxy Tumbler, Silicone Tumbler Protector for Resin Paint,Cup Silicone Insert Paint Spray Shield, Epoxy Resin Cup Protector Clean Rims DIY Glitter Epoxy Tumblers (5)

Lose coverage doesn't hold very well around the cup.

So far they haven’t been any better than using tape because the 2 sizes I’ve tried have been lose fitting.

These are loose fitting they fall off cup while spinnig until adhered by resin but they do what there intended for

Don’t stay in cups, therefore useless. Probably better products out there

Didn’t work for me but not a bad product

I was realllllly wanting to love these. Unfortunately the concept is great, but the execution results in an epoxy "lip" around the edge of the tumbler. I will not continue using and do not recommend.

Ended having to return these,they did not fit any of my cups of any size and are loose they slip off

I was so hoping these would be a answer to keeping the resin from getting on the inside of my cup. But they don’t fit snugly enough to do that. They fall out if you turn the cup over. Now they are worthless to me. I hope other people learn from my review and save their money.