do not sand were you can not get the buffer un less you like hand rubbing .keep of the edges or you can sand off the paint or buff it off.you will need air movement. it needs to be some thing to pull and push this can be done by putting a heater fillter in a window or door way and a fan to pull it out use a window or door way .the air you do not need fans blowing in unless you want lots and lots of dirt. when painting start from the farthest from the fan that pull the paint out .wet the floor down. whipe the first 3 feet of the air hose down use old tack rag.so no junk get in the paint. get a cheap painter suit and a painter sock to keep hair out of the paint make shure you have a very good watertrap and fillter. and good luck . when paint keep the gun inside and out clean wipe cup off so there is on junk on it from were you set it.so junk will not get in the paint. i tape off a spot with paper on the bench for this