What I would suggest is to scuff/wetsand the old organisol good, and then spray one or two coats of Black PPG DP90 epoxy primer over that. Then within one day to one week, spray the new organisol.

The reasons why I use the black epoxy are due to the incompatibility issue, and the new organisol (at least the one I used) is not fuel tolerant and will become disrupted with a fuel spill. The black epoxy primer combats against bleeding through to the undercoats and it is the most unoticeable since it is similar in sheen and color.


Good luck to you,
Greg.