What your state allows
Updated
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Making it is largely unregulated
There is no process to file and no inspection of the kind the food crafts face. What applies is general workplace safety if you have anybody working for you, and that is a different conversation from a license.
Waste is where it gets specific
Uncured resin, hardener, solvent and contaminated rags are regulated waste in most places, and the thresholds and routes vary. Cured resin is usually ordinary waste. Ask your local authority what applies at your volume rather than assuming the household rules cover it.
Selling to consumers brings the FHSA in
If what you sell is the resin itself rather than a finished casting, you are selling a chemical into households and the Federal Hazardous Substances Act reaches it. That is a labeling regime with its own requirements and it catches people who start reselling kits.
Finished pieces are a different product entirely
A cured coaster is an article, not a chemical. Selling those raises the questions any craft product raises, and if they are intended for children it raises a much heavier set about toy safety that is worth researching before, not after.
Anything food contact is its own question
A resin-coated board or a tumbler is a food contact claim, and whether a cured resin is suitable for it depends on the specific product and what the manufacturer says about it. Treat a food-safe claim as something you must be able to support from the manufacturer rather than infer.
Record who told you what
Name, date, what you described and what they said. Guidance gets restated and staff change, and a specific conversation you can point at is a different position from a recollection.