Changes of rim paintings!

Upon pressure of the automotive companies, all rim manufacturers have changed over to "water-soluble paintings" in the year 2005. So far "solvent-containing paintings" were in use. Those paintings contain waxes, which allow exhalations when burning-in the paintings and avoid the formation of blisters. The formerly added solvents mostly compensated the waxes. This is no longer the case with the water-soluble paintings and thus various wax concentrations develop on the adhesion surfaces, which can only be removed by a wet cleaning with e. g. isopropanol (70 - 75 %). The required surface tension values of > 32 mN/m can only be achieved with such a pretreatment! Without a precleaning the adhesion values drop below 28 mN/m and a secure adhesion is not obtained, and after 1 or 2 days the weights may detach from the rim for no apparent reason.