I just finished a 120x120. Spray basted with 505 using Patsy Thompson's method of spray basting against a wall. I did it in the garage, but there was no problem with overspray as I used a drop cloth. I have read many negative comments about spray basting. Some sprays have a strong odor and don't even hold well or for long. The 505 was perfect. The trick is getting just the right amount of product on the back and batt. This was closely quilted on my Bernina 440 EQ and came out beautiful. I will never pin baste again!