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drinking cups?


I have used casting epoxy for vases to waterproof them but nothing says NO about coating inside of a cup with it.

(02-08-2024, 12:09 AM)Arlin Eastman Wrote: [ -> ]drinking cups?


I have used casting epoxy for vases to waterproof them but nothing says NO about coating inside of a cup with it.

Ask the manufacture of the epoxy if it is approved for food contact.    I know there are epoxies approved for water tanks but unless the particular epoxy was tested and approved you won't see a yes.  Epoxies come in too many flavors to say all epoxy is ok.   Roly

I did a lot of checking the internet and all of it says once cured it is good to go but total cure is up to a month.

(02-10-2024, 12:35 PM)Arlin Eastman Wrote: [ -> ]I did a lot of checking the internet and all of it says once cured it is good to go but total cure is up to a month.

The manufacturer for the specific epoxy that you are considering should have a Safety Data Sheet (SDS) (what we used to call a Material Safety Data Sheet (MSDS)).

The SDS is primarily concerned with safety issues for the person handling the raw materials and the as-mixed epoxy, but some mention the as-cured material.

Some of the modern epoxies are food safe when fully-cured (however long that takes).

The epoxies that I helped my father with doing fiberglassing for boats were some that I would never want to trust to drink out of. That was 60ish years ago and there were materials in the catalyst that were definitely not people-friendly.

It is sorta like needing to understand what wood is safe to make tea out of: sassafras - good, hemlock - bad.

(02-12-2024, 06:57 PM)iclark Wrote: [ -> ]The manufacturer for the specific epoxy that you are considering should have a Safety Data Sheet (SDS) (what we used to call a Material Safety Data Sheet (MSDS)).

The SDS is primarily concerned with safety issues for the person handling the raw materials and the as-mixed epoxy, but some mention the as-cured material.

Some of the modern epoxies are food safe when fully-cured (however long that takes).

The epoxies that I helped my father with doing fiberglassing for boats were some that I would never want to trust to drink out of. That was 60ish years ago and there were materials in the catalyst that were definitely not people-friendly.

It is sorta like needing to understand what wood is safe to make tea out of: sassafras - good, hemlock - bad.