I had 4 Polyform G5 which cleaned up afterwards ok, they were not sticky, but they had embedded stains, and nothing could remove, bleach, gas, acetone, etc...
Went looking again for a vinyl paint and tried this Duplicolor. They turned out nice looking and the paint is well stuck on the fenders. They are rinsed off in the pics, so not glossy looking.
I let them dry for a week before use. Strung them along a rope for painting. Took 1.5 cans to paint 3 fenders. The paint is $8 at O'reilly's auto part, which is best price around.