Hi everyone, I have been lurking here for awhile to try and find a answer to my specific issue, but I couldn't really get a good feel for what I am doing wrong so I thought I would make a post to try and ask the experts here for help. First let me say I am in no way a expert, I know enough to get by but thats about it.. so any help would be really appreciated.. OK here goes..
My hobby is restoring old pinball machines from the 60s and 70s. My process is to strip them to bare wood then sand, bondo, sand more, etc etc till smooth, then prime, paint base coat, add a coat of polycrylic, then stencil first color, then polycrylic again, then stencil second color then polycrylic to finish up.
The reason why I lay polycrylic after the base coat and then between stencil colors is that the paint I use is a flat paint and I have found that the stencils do not adhere to the flat very well if at all. Its like trying to make a piece of tape stick to sand paper. So if it wont stick very well I will get runs and not very sharp edges in the stencils. So by adding a base of Minwax semi gloss polycrylic over the base paint, the stencils will have something to stick to. I have had good success with this method for awhile now, however the last cabinet I just restored had issues. after painting my first color stencil, the stencil tack (as I would pull it up) would pull up the polycrylic with it. For some reason my polycrylic would not adhere to the cabinet at all in certain areas. I should say that the stencils I use are a vinyl type stencil with a low tack on the underside.
So this is the first cabinet that has had this issue. The paint I am using is a rattle can graffiti paint called 94. The reason why I use it is that the base coat white is a exact match to the original factory colors and they are of the low pressure variety so it really reduces the chance for runs and such.
So anyway... The only thing I have done differently with the polycrylic this time as opposed to previous times is that I used foam brushes this time to apply it. I am wondering if anyone thinks that maybe a foam brush might be the culprit here to my adhesion problems? Also At first I thought it might be the Minwax brand of Poly so I went and bought a better brand and I had the exact same issues. I really dont want to strip this cabinet again for a third time only to have the same issues arise. not to mention that the stencils are rather expensive and they are of a one time use only. So if anyone has any advice or would know why the polycrylic is not adhering to my base I would love to know. Thanks again for any help you can give..
PS.. for reference, this is the brand of paint I use.