For spray basting on the floor, be sure to lay down a flat sheet larger than your quilt first, to catch overspray. Also, spray from the edge towards the center to minimize overspray. Keep as many doors and windows as possible open for air circulation, and afterwards I would turn on a fan and air out the RV. Basting sprays have chemicals in them that are not good to breathe, so be careful. I strongly recommend using 505 brand basting spray -- no horrible odor and the most reliable brand on the market.