Best permanent paint marker for several custom applications and modifications and art works, valve action felt tip. Marks on ANYTHING! Oil and Acrylic are both equally as good. Why nobody I know does not know about these amazing markers? Can not say, but I swear by them for my back grounds in my paintings. White and red marker colours are f'n solid, yellow is also opaque af. That's how I grade a brand. I only wish for Carmel they had more colours(at least 3 shades of each available?). Also low gloss colours would be beneficial. Love it, buying more when needed. Would also buy refillable? @dust1designs Thanks. P.S. These are out door grade permanent, NOT for children AT ALL. The Acrylic base is okay in my opinion for kids 12.