HI,I,M LOOKING FOR A CLEAR COAT TO GO OVER COVERITE WHITE WITH RED TRIM.THAT WILL NOT YELLOW.TRIED NELSON GLOSS CLEAR AND NOT HAPPY WITH IT.I HAVE READ HERE THAT IT IS GOOD PAINT,MAYBE DOING SOMTHING WRONG,USING 30PSI MIXING ABOUT 40% WATER WITH A HVLP AIR GUN.I,M GETTING A SPOTY FINISH NOT A GLASS LIKE FINISH.NEED HELP.THANKS