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Problems masking over Gunze Sangyo Gloss Acrylics

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  • Member since
    September 2003
  • From: Australia
Problems masking over Gunze Sangyo Gloss Acrylics
Posted by Helo H-34 on Sunday, September 18, 2005 7:10 PM
I've been airbrushing Gunze Sangyo acrylics with my Badger 155 Anthem airbrush ; Thinning the paint 50/50 with Isopropyl Alcohol . I'm more than happy with the results, however lately I've noticed that when I mask over Gunze gloss using Tamiya masking tape and sometimes 3M blue low tack tape , the masking tape marks the gloss finish . I don't mean it lift's the paint off , but rather it almost looks if some of the tape residue is left behind . Although it doesn't feel tacky , but you can see where the masking tape was . I always remove the tape as soon as i've finished airbrushing - the thing I like about Gunze is that it doesn't take long to dry . So recently I started building a series of U.S.Navy fighter jets with the Gull Gray over White paint scheme [H-315/316] but when I mask over the white finish to spray the Gray ,I'm left with the already mentioned dilema . Last weekend I airbrushed the H-316 over my 1/72 A-7 Corsair II Disapprove [V], I then let the paint dry for a whole week ; and this past saturday morning I masked off the white area , sprayed in the afternoon , when finished cleaned up the airbrush , put everything away , and then proceeded to remove the masking tape and discovered the same problem had happened again ? What is going wrong - this doesn't happen when I'm using Gunze Flat paints . Any help and advice is greatly appreciated . { I have over 20 Navy aircraft in my stash to do , with the Gull Gray over white finish , I've almost hit the wall over this problem ]. PLEASE HELP !!!! Kind regards John.

  • Member since
    April 2004
  • From: The cornfields of Ohio
Posted by crockett on Sunday, September 18, 2005 7:14 PM
I think you should thin Gunze acrylics with only Windex. You will find that your problem will disappear.

Steve
  • Member since
    September 2003
  • From: Australia
Posted by Helo H-34 on Sunday, September 18, 2005 10:19 PM
Thank's for the tip crockett , I'm a little concerned about spraying paint thinned with windex - the ammonia is what worry's me .While spraying I do wear a respirator and spray in front of an exhaust fan to suck out most of the overspray [fumes] etc . I should also mention that I realize that white is probably the most difficult color to spray ; so I always airbrush 3-4 coats of flat white first ; let it dry for 24 hours and then spray about 8-10 nice light even coats of gloss white . [Always trying to avoid spraying too heavy ] .

  • Member since
    January 2003
  • From: The Hoosier State
Posted by plasticmod992 on Monday, September 26, 2005 2:00 AM
I had this problem early on with Tamiya acrylic. What I figured was that the adhesive chemicals in the tape reacted to the paint film on the model...weird! It's somewhat strange, because It was white paint as well. I noticed that when this happened, at the time I was using Tamiay's brand acrylic thinner. When I switched thinner to store-brand 70% Isoprophol alcohol, let the paint dry overnight, masked and removed the Tamiya tape- no problems. I experimented with Windex as a thinner as well, but I didn't like the spraying characterists; although it does work. With Windex, I noticed that it broke down the paint to much, causing the paint to blush, when airbrushed on the model. Just my observations. Good luck to ya.
Greg Williams Owner/ Manager Modern Hobbies LLC Indianapolis, IN. IPMS #44084
  • Member since
    November 2005
Posted by Anonymous on Thursday, September 29, 2005 6:54 PM
I had the same problem - any thoughts as to how to resolve it once i've made a mess of the nice gloss finish? did you try overspraying with Future?
  • Member since
    July 2003
  • From: Bicester, England
Posted by KJ200 on Friday, September 30, 2005 7:40 AM
I've had the same problems with Gunze gloss acrylics, in that the tape leaves a slight mark, even on areas which have been left to dry for a week. What I have found is that a coat of Future renders the marks invisible, so by the time I hit the decal stage it's not an issue.

Karl

Currently on the bench: AZ Models 1/72 Mig 17PF

  • Member since
    May 2005
Posted by Ron Smith on Friday, September 30, 2005 10:53 AM
You've discovered the bugaboo about Gunze acrylic glosses, they dry quickly but take a month or more to cure. If the color you want is available in flat use the flat and just gloss coat it. If the color is only avaiable in gloss you have to bite the bullet and let it cure.....if you don't: masking tape will leave an impression, declas can fracture and Future will craze it.
  • Member since
    September 2003
  • From: Australia
Posted by Helo H-34 on Saturday, October 1, 2005 11:14 PM
Thank's for all the help everyone; I tried over-spraying the problem area with a few coats of future , as karl suggested , most of the marks disappeared-but not all of them. Although I did have to hold the model aircraft at different angles in bright light [sunlight coming in through the window ] , to see them . I also will take Ron's advice and wait a few weeks between masking over the gloss white finish and I'll let you guys Know the results some time down the track.. Kind Regards John

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