Mike,

I've been painting my APC props for years, and have never EVER had any problem at all.

After balancing the prop, I lightly roughen up the surface with fine sandpaper, and clean it thoroughly.

Then I prime it with rustoleum primer, and spray paint it with Rustoleum.

I nearly always paint the tips, often with various colored stripes, to dress it up. With warbirds, I use black, and always paint the tips either white or yellow.

When done, I re-balance, brushing a little paint on the tip to get a fine balance.

I've never had paint chip off of one of my props.

Mike