Need advice on stamping impermeable items

[csziggy]

2. OK, those look good and I can get them locally

Permanent is good and I am not worried about the stamps - they were purchased for this purpose. I did see some cleaner stuff specially for that ink - or is that just to clean off excess ink? I've looked at videos on YouTube that show using pads and others that use daubers to dab ink onto the stamps. Pads would be easier I expect.

How about a base paint for the magnets? I'd like to paint them some solid color. Would spray acrylic work OK? I'm thinking put the magnets on a pipe, spray lightly, let dry for a day or two, turn them over and spray the other side. On a small pipe, less of the magnet would be in contact with the surface to case a ridge from the paint.