[Jon]

Hi, I am new to this and am trying to epoxy a tumbler that has no glitter or anything on it. Do I need to sand or treat the surface before applying the epoxy? I tried without sanding and the epoxy had a couple dimples in it and when I was trying to get the dimples out, I saw that the epoxy would peel off of the surface of the tumbler.
Thanks for any help.
These are just tumblers like you would buy at Wal-Mart or other places..

[Katherine Swift]

Hi Jon,

Resin won’t stick to anything waxy, which sounds like it may be the surface of your cup. This article explains more: https://www.resinobsession.com/resin-resin-resin/surfaces-resin-wont-stick-to/

Yes, you should sand the surface of your cup.

[Jon Jones]

Thank you for your input. After feeling the tumbler, It is kinda slick/waxy feeling. What grit would be the best to sand it with? Thanks, Jon

[Katherine Swift]

Hi Jon,

It doesn’t need to be anything coarse. You only want to take the surface off. Start with an 800 grit and see if that works for you.

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