A couple light coats w cheap hairspray will work too. Spray your basecoat, after it dries, spray your hairspray, then apply the topcoat. Using an old stiff brush and warm water..rub the areas you want chipped.the water dissolves the hairspray leaving the base coat behind.probably the biggest tip here is don't leave the topcoat for several days before starting to chip...soon after applications works best. Just another option! Jeff