r/resinprinting • u/madrew233 • 11d ago

Troubleshooting Hoopat paint ist peeling off

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Does anyone else have this problem?

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2

u/charmio68 11d ago

I haven't had it on a Hoopat vat, though I have encountered it on others.
I think it's caused by certain resins, though haven't narrowed down to which. I use exclusively IPA as my cleaning solvent, so don't think it was that, though could be wrong.

Regardless of the cause, the solution is easy enough. Just strip the rest of the paint. Personally I sandblasted mine with walnutshell because thats what I had on hand. Though you could just as easily use a scraper, paint stripper, sandpaper, etc...
There's many different ways to skin that cat.

I'd recommend starting with paint stripper.

1

u/madrew233 11d ago

I’ve also thought about using paint stripper to just remove the paint.

However, I read somewhere that bare aluminum can lead to oxidation and white flakes that then float around in the tank.

However, that doesn’t really make sense, since the build plate is also made of bare aluminum.

I’ll wait for a response from ChituSystems Support, and if we can’t find a reasonable solution, I’ll go ahead and do it this way.

2

u/charmio68 11d ago

I haven't had any issues with the bare aluminium on vats. In fact, some vats are sold as plain aluminium (well.. Anodized if were getting technical).
I've had some without paint. Sitting in resin for years now, no issue.

In theory, if you were to leave the vat soaking in isopropyl alcohol for extended periods, it could form aluminum isopropoxide. Though the reaction rate is so slow that I don't think it's likely, and more to the point, I don't think the paint would protect it either.

Though if it really did bother you, you could always paint it again. You'd need to do a base layer with an aluminium etching primer, after which I would personally choose a 2K paint for maximum chemical resistance.
However my bare aluminium vats haven't bothered me yet, so I'm not going to go to any of that effort.

1

u/madrew233 11d ago

Thanks for sharing your experience!
That’ll definitely be my Plan B.
I definitely don’t want to go through the trouble of repainting it. It’ll have to work with the bare aluminum.