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This can't be a common procedure3/18
I am not a finisher but have worked fairly extensively with waterborne products. The biggest downside of WB as we all know is the long cure times.
That being said I go into our spray room on more than one occasion and watch our finisher spraying our usual SW post cat pigmented CV.
The pieces he is spraying are small bedroom night stands. Basically small 2' x 2' cubes. I had him spray the interiors prior to assembly as they have two drawers and a small open area between the drawers which would have been difficult to access once assembled. The front opening is now tape/papered off to protect the interior leaving only the exterior cube to finish. Doesn't get much easier than that, right.
Now I did not watch him spray the initial prime/first coat. On the final coat I witness him tape/paper off sides of the piece that had been final coated and then spray the next side.
Now I have seen him do this on larger pieces and was dubious of the practice but gave him the benefit of the doubt, But a 2' cube? No way. If that's the case then may as well go to WB that stays wet long enough to spray an entire piece without issue. The shop is equipped with top notch heated booth.
Is this a common issue you guys have with CV? I don't want to question someone's competence in an area that is not my expertise but this guy has me shaking my head on a daily basis
If he is spraying in a well functioning booth and has used the proper thinners this shouldn't be required.
It also depends on what you are spraying it with. An HVLP might be to slow to keep things wet, a AAA pump would be more than enough to do the whole cube and keep a wet edge as long as you were using the proper tip.
We have no idea where your shop is, so no idea of ambient temps and humidity. Also no idea if you use heated make up air which also decreases flash over on the cv. If you don't believe the finisher, it would be easy for him to spray one without masking off and you can see for yourself.
Sometimes slowing the dry time is the
Taping off the interior sounds normal but not each side? You could flip it backwards, and
He doesn't know what he is doing(I hate writing this).
Its not necessary at all. As others have noted, use the correct reducers if spraying large objects. On a 2' x 2' cube it is not even that important. You can get tons of finish on that small box before it even thinks about drying.
If he is getting overspray on an adjacent face then he has the box improperly setup to the exhaust fan. The fan may be pulling the overspray on to the panel.
We have been spraying wb and solvent for 20 years and never had to do anything like masking adjacent panels.