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

[nzo 16]

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.

Edited December 2, 2017 by Guest

[kmanstudios 1,120]

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 December 2, 2017 by Guest

[nzo 16]

Sorry...doubled

Edited December 3, 2017 by Guest

[nzo 16]

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 December 3, 2017 by Guest

[kmanstudios 1,120]

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?