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I am fairly new to the cabinet making trade.
I have never had to mask off the back of my doors for overspray issues, If they're having those issues it's most likely that the door is too close to a large surface, IE they put a turntable on a normal bench/table and theres only 8 or so inches of space, this can create blowback, especially if their spray set up is using too much air.
When I was using a precat I didn't have issues with over spray on the backsides of the door after spraying the final coat on the front side.
I switched over to a post cat and I had over spray issues. Nothing else changed. I don't paper the backs, I cut a pc of cardboard and lay it under the door. When I do the final coat on the face I order the doors from large to small and usually I can get away with one or 2 pcs of cardboard on a set of kitchen doors.
The major cause of over spray on the back of the door is spraying the edges. If you only spray the topside (square edged doors only) you get no over spray on the back side.
A friend of mine works in a large cabinet shop that I visit from time to time and there finisher was putting paper on the backs of the doors and masking around the edge. I noticed when he was done and pulled the mask there was a distinct line around the edge of the door where he pulled the tape. I am not sure how or if he addressed that.
I agree with Tyler, it's usually a blow back problem.
Thanks everyone, a lot of helpful info and tips.
We’ve always used a turn table with screws standing up as legs. The table is always smaller than the doors. The spray goes down at approx 45 degrees. No real way for it to come back up. Never had any issues. I’ve never even thought about it.
Papering and masking would piss me off. I would build a machine to avoid it.