I use enamels, so cannot help much with a specific acrylic paint. I would try mixing some retarder in the acrylic, however. Even with the enamels, they dry VERY fast when drybrushing, and it is easier when they are not completely dry. I pick up a little paint on brush, smear it on card stock, and pick it up from there, and it is hard to keep it wet enough to apply, but dry enough to get the translucent drybrush effect. I do only the smallest amount at a time, as I know it will dry and become unusable immediately. So, for virtually every stroke I dip the brush in paint, smear it on card, and go from there.