I have been wondering what to do about vessels where the cracks go all the way through to the inside. So I am running an experiment on this Vintage bean pot. Burnham and Morrill, of B&M baked beans, used to sell their beans in grocery stores in crocks; eventually switching to cans, though they do sell a small amber glass pot that looks like a crock. The beans could be heated in the oven in the crock it came in. This larger size was an unusual find, as I only remember the half pint size.
Foodsafe adhesives are often the ones used in plumbing and gasket repair, and will have all of the features listed. Silicone RTV 4500 FDA Grade High Strength Silicone Sealant is FDA grade foodsafe and withstands a continuous temp of 350F, as well as waterproof and self curing. Self curing means it will solidify on it’s own and unlike a two part epoxy doesn’t need to be mixed with a hardener. The ethylene vinyl alcohol (EVOH) polymers used in foodsafe adhesives are derived from acetic acid, so it will smell like vinegar. It will also be flexible when dried. I have a few projects, this will be a good first experiment.
This crack seems to be only a hairline on the inside, so I really just need to seal the crack, to prevent moisture from getting in. I used a plastic spatula to smear it across the crack and removed the excess so there would be no adhesive ridges making it hard to clean later.
For good measure I smeared the excess adhesive over the outside crack, pressing it into any voids. Luckily this crack was just that and there are no holes to fill. The brown glaze has a smooth finish, but the cream color has a textured satin finish, resembling an unglazed pot. So the adhesive blended right in. If it were a high gloss the excess may have had to be removed with a razor blade when it dries. I am very pleased with the results and look forward to other projects.