Reply by jonlan

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Posted on Strange behavior in finish when HVLP spraying

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72 posts in 2168 days

#1 posted 12-09-2019 03:14 AM

@CaptainKultz . Thanks for the feedback! I’ll admit that as much as I try to “take it slow” i often end up rushing things. My view of primer has always been to raise the grain and help fill in voids to give an even surface. With that mindset – my thinking was that after the primer dried it had done its job and I could sand it down as needed. My thinking was that in the worst case scenario I’d had to put on another coat of top coat to cover up any areas that I needed to (where I had sanded through the primer). What you say makes good sense to me though.

The issue I have is that I have had a hell of time HVLP spraying SW primer. I can’t recall if I had previously tried thinning it (although I’m sure I have) but I even went as far as buying a dedicated HVLP gun with a larger jet (needle set?) to get it to pass through the gun correctly. In any case – it does the job of getting the primer on the project, but I don’t think it’s very pretty. But again – I didnt care since I knew I’d be sanding it. Perhaps I should talk to them about thinners for both the primer and the oil based paint and try that? I think in the past when I’ve gotten the primer to go on it wasnt smooth either hence more sanding. Maybe I do just need to thin it down. I agree that having a final “primer” coat would likely help with most of my issues.

The other problem I have is the actual application of the paint. Once I get passed the first coat, I have a heck of a time seeing the paint lay down. I’ve tried using dedicated work lights at different angles but I can never quite seem to see where I’ve been. This combined with my poor spray technique (which Im working on) is definitely hurting me. I’m trying harder to be more consistent and do full passes in one spray each time but again with not being able to see the coat going on this is challenging. I spend a lot of my time wondering if the gun is even shooting and feel the need to check often to make sure it is.

I’d be open to any tips you have on that matter as well.

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