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Sorting over zealous spraying


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Hi. I sprayed a small tank loco 3D print with Halfords primer which went on well. I then turned to Halfords Matt black. It mostly went on fine, but one pretty visible area on the boiler has suffered from ‘pooling’ where too much paint has been sprayed on and it looks thicker than areas around it. How do I flatten that out without stripping the whole model back? Gently use cellulose thinners? I think I may have read That lighter fluid can help? Any thoughts? Thanks Colin 

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Halfords spray cans are rather like letting off a fire extinguisher. When applying on small models best to hold the can at least 12" away with continuous motion and start the spray before the nozzle is facing the model (ie to the side and wave slowly back and forth across the model).

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What is it printed in? Polyurethane? Nylon? Acrylic resin? It makes a difference as to what chemicals can safely be used.

 

If the print material will withstand it, airbrush cleaner such as "Liquid Reamer" will remove acrylic paint (and also Halfords primer). However, it will also remove acrylic resin and I fear what it might do to PU; nylon is probably safer, but no promises.

 

If you do have an acrylic print (e.g. Shapeways detail plastic) then I suspect that no chemical which will remove acrylic primer is safe to use. Your only recourse is to rub down the extra paint.

Edited by Guy Rixon
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It’s Printed in shapeways finest smooth detail plastic. 
 

I should have said it is only one small area that has pooled and I’m hoping I can use something to smooth it out before respraying. I do use gentle sweeping motions from 12” or so away. The issue is that this model is small (009) and I was trying to get into all the nooks, and I slightly overdid it. 
 

still thinking gentle application with a cotton bud with isopropyl alcohol or cellulose thinners...??

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Guest Half-full

I would let it dry fully and take a glass fibre pen to it, gradually remove the affected paint to the surface, feather the edges in, then re-prime/paint.

 

Thats probably the safest way to do it due to the unknown reaction of chemicals to the printed material

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