I have done some experimenting with painted wood as I am making little painted and stamped jewelry boxes for my nieces for Christmas...
I used Stazon to stamp my image with and filled in using classic ink and a blender pen - I then heat set my images with my embossing gun...
Here comes the tricky part - I went to go and apply a sealer coat on them - I used Krylon...
and it ran...horribly if the image was not flat (i.e. I would spray and the images on the sides would run from gravity and I would spray it using a light hand)
I came here and got some suggestions - one suggestion was Krylon fixif - which I got and I had the same problem - only it didn't run as bad.
Some ideas I got but haven't tried yet
- use acrylic paint to stamp with and then use a polyurathane to seal
- use a water-based sealer - some said you can find this at Wal-mart for about $7-8
-someone else suggested useing Patrica Nimrock (sp????) to seal tiles - maybe this would work on stamped wood