I am using the Gundam Paint markers for some of the sentai minip-pla, and am noticing that the primary colors, like blue, red, and yellow, are not taking very well the first few times. am i missing somthing as a base coat? i use alcohol pads to help clean the surface, and i do the cleaning multi times. but the black seems to take very well. any helpful tips or advise with the gundam markers would make my life a little less stressful.