Haven't used Best Press so can't answer that question for you. I use the Sta-Flo liquid starch and make up a quantity as I go - about 50/50. I spray the top of my fabric. I find that concentration 'ok' for bias cuts but would probably have better results if I used a slightly heavier concentration. Might try that next time, come to think of it! I don't know that it really matters if you starch the front or the back but I look at - why make extra work flipping stuff back/forth. I do wash all of my completed quilts so any residual is washed away. Then again, by the time I get done hand quilting them, I don't know that there's really much starch left in them.