We have purchased permacast (fiber glass) structural columns to support an arbor. The columns and capitals primed and painted nicely with water based primer and laxtex paint (we used a sprayer) The bases are not structural and appear to be polyurethane. The primer peels off extremely easy. The Primer is Bejamin Moore 100% acrylic Primer. The can says it will stay on formica. I can't understand way it won't adhere to the column bases.