Years ago, I had a similar problem with dope storage. Seals would disintegrate, lids would rust, dope dried up etc., so I ordered some glass jars from McMaster Carr. These have phenolic lids and Teflon seals. Ended the problem, but at a price $$$! You might be able to cut new seals from HDPE and save your original lids (maybe margarine tub lids).
Norm