I work at a Home Depot and have experience with both the Behr and Ralph Lauren Crackle glazes. For either one it is best to use a satin or a semi-gloss base coat (they dont absorb so much of the glaze)and a matte topcoat(the less gloss there is, the easier it is for the paint to pull apart and crack). Regardless of which brand you use, the size of the cracks and the direction they go can be controlled. The application of the topcoat determines these, so for thicker cracks, apply a thicker topcoat and for thinner cracks, apply a thinner topcoat. You can apply the topcoat with a brush, a roller or even a sponge, but keep in mind that the cracks go in the pattern that the paint was applied. Have fun!