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Severe "Powdering" Problem

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5 replies
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  • Member since
    July 2013
  • From: Chicago area
Posted by modelmaker66 on Sunday, November 30, 2014 1:15 AM

Rook is right. To high a pressure and too this a paint will cause a rough texture. Just did it today to myself after  many years practice.

  • Member since
    August 2014
Posted by BlackRook on Wednesday, November 26, 2014 3:48 PM

This is being caused by the media drying before it hits the surface.  You want it to go on wet (but in a thin layer).

Are you spraying with high (15+ psi) pressure?  Also, are you putting it on 100% undiluted, or thinning it with something?  You can try (TRY) using some Acrylic Flow Improver, that will give the medium a few more seconds before it dries.

Flow Improver can be found in hobby stores, or Amazon:  www.amazon.com/.../ref=sr_1_2

  • Member since
    September 2013
Posted by cvsaylr on Wednesday, November 5, 2014 9:29 AM

Thanks for the info about photo uploads

Dave

  • Member since
    September 2013
Posted by cvsaylr on Wednesday, November 5, 2014 9:27 AM

My guess at the temperatureis about 65-68F

Dave

  • Member since
    July 2014
Posted by modelcrazy on Wednesday, November 5, 2014 8:19 AM

I use 20 15 yo gloss and dullcote cans so I don't think it's the age. What was the temperature?

BTW, to upload pics you need to get a Photobucket or some other hosting site. Take you picture and upload to Photobucket. Use "rich formatting" to upload your picture from Photobucket. You can check to see if it worked by pressing the preview tab while in rich formatting.

You can also check "How to upload photos to a post?" in the Technical Assistance forum.

Steve

Building a kit from your stash is like cutting a head off a Hydra, two more take it's place.

 

 

http://www.spamodeler.com/forum/

  • Member since
    September 2013
Severe "Powdering" Problem
Posted by cvsaylr on Wednesday, November 5, 2014 8:02 AM

Hi Folks,

Now that fall is here and temperatures in PA are not conducive to outdoor activities I decided to finally finish that TBF that I was working on until last spring. Anyway, the last step I had done before summer rolled around was to put the decals on. When I started up again, I first applied a gloss coat (I used Testor's Glosscote lacquer) and did my weathering, wear and tear, etc. I then applied a flat coat (Testor's Dullcote lacquer).

Problem is that after the flat coat dried there was a very noticeable "powdering" (I don't know what else to call it) all over the model which was especially noticeable on the dark blue that covers the top of the fuselage and wings. I first tried to wash it off but when that didn't work I had to rub it out with a piece of 0000 steel wool. I still have some powdering but it's a lot less than before I rubbed it out. What I want to know is, how can I prevent the dullcote from powdering in the first place? I'm sure there's a solution but I have no idea what it is. Unfortunately I have no idea how to upload photos else I would. BTW, the glosscote went on just fine and both the glosscote and dullcote are "new" bottles (less than 6 mos old).

Dave 

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