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PLA - Post processing: if it aint one problem it's another :)

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Posted (edited) · PLA - Post processing: if it aint one problem it's another :)

Just been giving my red PLA 'Thomas the Tank Engine' cookie cutter a light coat of Crystal Kote matte varnish straight out of the printer (after cooling) to help future proof the print. Lo and behold now some of the print has developed a patchy white bloom on the red.

Something in this PLA doesn't play well with this varnish. Sigh.

5a3341706de23_thomas-whitebloom.thumb.jpg.f510a6eeb08baba711c260e448287fbd.jpg

5a3341706de23_thomas-whitebloom.thumb.jpg.f510a6eeb08baba711c260e448287fbd.jpg

Edited by Guest

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Posted (edited) · PLA - Post processing: if it aint one problem it's another :)

Just a few things that pop into the wee noggin here....

  • Spray or brush on?
  • Print fully cooled?
  • Are there humidity warnings or issues?
  • Other moisture issues?
  • Did you try to dab a bit of thinner on the blushing and then recoat?
  • WanHao PLA?

Edited by Guest

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Posted (edited) · PLA - Post processing: if it aint one problem it's another :)

Sorry...doubled

Edited by Guest

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Posted (edited) · PLA - Post processing: if it aint one problem it's another :)

Hi kman, and thank you for sacrificing some of your Christmas shopping and printing time :)

  • Spray. Thinly several times with in-between drying.
  • Cooled prints.
  • No humidity warnings or issues that i could see
  • I've been running a dehumidifier in the print room. Humidity hovers between 39% and 43%.
  • Haven't tried thinners yet
  • Filament has been kept dry in supplied ziplock packaging with some dessicant.
  • Yes, Wanhao filament. :angry:

My noggin is officially full! :)

Edited by Guest

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Posted · PLA - Post processing: if it aint one problem it's another :)

OK, that would rule out most of the issues I could think of based on experience other than chemical incompatibilities. Not all plastics will accept all sprays.

Maybe try a different brand of spray?

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