I only use the oil paints because acrylic is a water based paint and it can hinder the curing process. What I do is pour a small amount of pr into a little Dixie drinking cup about a 1/4" thick then mix in the amount of oil paint I want. once that is mixed together at a smooth consistency with no major lumps of paint then I pout more resin into the cup and mix that together. If you pour a cup full of resin then mix in your paint it will not mix in a good consistency and will be lumpy.