Spookytooth Posted January 28, 2014 Share Posted January 28, 2014 Hi all, just a question. I have heard that Vallejo paints ( Model Master and Model Air ) can be sprayed over Tamiya acrylics but not vise versa . Any truth in the matter. Simon. Link to comment Share on other sites More sharing options...
Giorgio N Posted January 28, 2014 Share Posted January 28, 2014 Yes and no. In reality it depends a lot on what you use to thin the tamiya paint: if they are thinned with too aggressive thinners or with lot of thinner, then the underlying coat of vallejo could be affected. If you thin them with something less aggressive, then there's no problem. Only last week I had to repaint an Airfix harrier that had a coat of Vallejo dark sea grey that I was not happy with. I loaded the airbrush with some tamiya paint thinned with little thinner (IPA), some klear and a couple of drops of flow improver and everything went fine with no problem whatsoever. Vallejos can of course be used over tamiya acrylics. In this case however I'd wait for a little longer... tamiya paints may look dry to the touch but in reality are still curing. If a fast drying paint is added on top, the bottom layer can react resulting in small web-like crazes. Better wait a good 24 hrs before overcoating tamiyas Link to comment Share on other sites More sharing options...
Spookytooth Posted January 28, 2014 Author Share Posted January 28, 2014 Thanks Giorgio. Just the answer I needed. I use I.P.A to thin, is that to agressive? Link to comment Share on other sites More sharing options...
DannyB Posted January 28, 2014 Share Posted January 28, 2014 A little off topic from the OP (sorry about the hijack Spookytooth) but does anyone know if vallejo modelair is compatible with Tamiya acrylic thinner X20a or IPA? I've picked up some modelair to try, the main attraction being that apparently they can be 'sprayed straight from the bottle' so didn't bother picking up any of their thinner, but I'm now finding that they most definitely need thinning! Link to comment Share on other sites More sharing options...
JasonC Posted January 28, 2014 Share Posted January 28, 2014 A little off topic from the OP (sorry about the hijack Spookytooth) but does anyone know if vallejo modelair is compatible with Tamiya acrylic thinner X20a or IPA? I've picked up some modelair to try, the main attraction being that apparently they can be 'sprayed straight from the bottle' so didn't bother picking up any of their thinner, but I'm now finding that they most definitely need thinning! Check out this chart, care of Model Airplane International and via the Little Cars website: http://www.little-cars.co.uk/workbench49.pdf It would suggest a bit of care is needed, since it says that the paint/thinner combinations you're asking about might not be totally compatible. It does however give a couple of other options (e.g. water or water/screenwash). cheers, Jason 2 Link to comment Share on other sites More sharing options...
DannyB Posted January 28, 2014 Share Posted January 28, 2014 Awesome, thank you Jason. Link to comment Share on other sites More sharing options...
snapper_city Posted January 28, 2014 Share Posted January 28, 2014 (edited) THIS stuff is also meant to be good with a useful paint to thinner ratio chart on the post. One thing I find is that temperature can radically alter how much thinner is required. Most of the year I use my normal ratio amounts but come the summer my thinner levels are no where near the amount required when its colder. Also when spraying over differing paints make sure the under colour has fully cured. It might look dry but 24 hrs plus between coats is best.. Edited January 28, 2014 by snapper_city Link to comment Share on other sites More sharing options...
Giorgio N Posted January 28, 2014 Share Posted January 28, 2014 I don't think IPA is particularly aggressive. I use ethyl alcohol for tamiya paints and THAT is aggressive on vallejos, so much that I use the same to clean my airbrush. In any case, you can do a simple test: paint a surface with vallejos, let cure for a a few hours and then try to remove the paint using the IPA. Regarding the use of IPA as a thinner for vallejos, I prefer to use tap water with some flow improver/retarder (that is glycol alcohol in the end). Link to comment Share on other sites More sharing options...
Spookytooth Posted January 28, 2014 Author Share Posted January 28, 2014 I don't think IPA is particularly aggressive. I use ethyl alcohol for tamiya paints and THAT is aggressive on vallejos, so much that I use the same to clean my airbrush. In any case, you can do a simple test: paint a surface with vallejos, let cure for a a few hours and then try to remove the paint using the IPA. Regarding the use of IPA as a thinner for vallejos, I prefer to use tap water with some flow improver/retarder (that is glycol alcohol in the end). Thank you Giorgio, That clears that up for me. I now consider my paint options more openly. Cheers. Simon. Link to comment Share on other sites More sharing options...
chaddy Posted January 28, 2014 Share Posted January 28, 2014 A little off topic from the OP (sorry about the hijack Spookytooth) but does anyone know if vallejo modelair is compatible with Tamiya acrylic thinner X20a or IPA? I've picked up some modelair to try, the main attraction being that apparently they can be 'sprayed straight from the bottle' so didn't bother picking up any of their thinner, but I'm now finding that they most definitely need thinning! I've used Tamiya thinner with Modelair and I wouldn't recommend it. I blame the combination for producing a "mush" in the airbrush that required a lot of cleaning to get rid of. Link to comment Share on other sites More sharing options...
aka1878 Posted January 29, 2014 Share Posted January 29, 2014 I've used Tamiya thinner with Modelair and I wouldn't recommend it. I blame the combination for producing a "mush" in the airbrush that required a lot of cleaning to get rid of. I concur! Link to comment Share on other sites More sharing options...
pte1643 Posted January 29, 2014 Share Posted January 29, 2014 I have heard that Vallejo paints ( Model Master and Model Air ) can be sprayed over Tamiya acrylics but not vise versa . Any truth in the matter. No truth at all. I've used Tamiya over Vallejo many many times. Link to comment Share on other sites More sharing options...
Spookytooth Posted January 29, 2014 Author Share Posted January 29, 2014 No truth at all. I've used Tamiya over Vallejo many many times. Thanks for that pte 1643. Simon. Link to comment Share on other sites More sharing options...
Danyel Posted May 11, 2015 Share Posted May 11, 2015 Check out this chart, care of Model Airplane International and via the Little Cars website: http://www.little-cars.co.uk/workbench49.pdf It would suggest a bit of care is needed, since it says that the paint/thinner combinations you're asking about might not be totally compatible. It does however give a couple of other options (e.g. water or water/screenwash). cheers, Jason Brilliant advice, Thanks Jason 1 Link to comment Share on other sites More sharing options...
cruiserguy Posted May 11, 2015 Share Posted May 11, 2015 Hi DannyB, I wouldn't risk ModelAir with Tamiya thinners. I think Tamiya's thinners are IPA based, and Vallejo Modelcolor turns to sludge if you thin it with IPA - trust me I know to my cost. My guess is ModelAir would be the same. Use Vallejo's own thinner or even its airbrush cleaner. As another poster has commented Ultimate Thinners is good too. I use both, but will change over to Ultimate completely when my Vallejo thinners are used up. Best Wishes, Will. Link to comment Share on other sites More sharing options...
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