Originally Posted by marklit
I have recently had the top sides on my Millkraft 45 painted. Original paint was 2 pack poly which was about 4 years old in OK condition. The painter I employed recommended using awl grip enamel and did what I thought was a good job at the time. Nine months after the job was complete the paint started bubbling in certain sections and coming off in small chips. I raised this with the painter and he tells me that it is because the enamel has caused some sort of chemical reaction with the poly which has caused the poly to separate from the old original undercoat. Has anyone heard of something like this happening before?
Hate to break it to ya, but your "painter" is the problem. Awlgrip is a 2 part polyurethane, not an enamel. Painting 2 part poly over 2 part poly requires only cleaning/degreasing with a surface prep solvent and then sanding/scuffing to a 320 grit profile. The bubbling you describe can occur when there are contaminants on the substrate that have not been removed properly with the surface prep solvent.
Anybody can apply paint. A skilled painter will do the prep necessary for a lasting finish.