temperature employed a time of from 10 to 15 minutes is usually adequate at the preferred temperatures a solution of h 3 po 4 0 2 by weight in ethyl acetate was prepared and a rectangular strip of reaction injection molded rim polyurethane having dimensions of 3 34 u00d7 5 8 34 u00d7 1 8 34 was dipped into a container of the solution and left there for 15 seconds it was then removed drained and air dried for 10 minutes and then placed in an oven at a temperature of 110 u00b0 c for 10 minutes to completely dry the strip after removing from the oven it was allowed to cool to room temperature and placed on a paper towel the following test was performed to determine wettability which correlates with paint adherence i e better wetting of the surface produces better adherance from a 25 u03bcl syringe 5 0 u03bcl of a polyglcol dowanol em having a molecular weight mw of about 76 was placed on the horizontal surface of the treated polyurethane five seconds after the polyglcol was placed on the surface the polyurethane strip was turned to a vertical position to allow the polyglycol to run down the face of the strip if there was little or.