18 Jan 2013, 02:03
I have made several business directional signs in recent years. They all have been fine except four of the same kind I made almost a year ago. They have sections of one shot paint peeled right off exposing the primer. I put a lot of care into my handpainted signs and never had this happen. I use oil based KILZ for the two coats of primer and then 1-2 coats of unthinned one shot white lettering enamel. I roll it on with a small dense 4" foam roller. Any ideas as to why this happened? I sanded in between and used a tack rag.
08 Apr 2013, 03:54
Regardless how good the primer or paint you use is, if the surface is contaminated your in for trouble. Sometimes when you faithfully clean a surface and follow the directions you can still get tripped up. Here is a couple examples. I use to work for a company that spray painted their products. This was probably the largest company in the world and the paint was peeling from their products. They spent thousands until they finally found the problem. To make a long story short the problem came from the orange industrial rags they usd to wipe down the already primed products before they were painted. The company that supplied the rags and the uniforms would clean them and return them to use over again. In the cleaning process they used Silicone which is a no no around paint.
Another problem I had through the years was vinyl lettering peeling which was tracked down to Windex used to clean the substrate. I actually thought it was great because it did not damage a painted surface like other cleaners. I then read in Signcraft that it was the culprit, stopped using it and problems went away. Hope this may help.