Gazzas Posted February 25, 2018 Share Posted February 25, 2018 HI Everyone, I've only been back in modelling for 3-4 years now. I generally use tube acrylic paint over either bare plastic or Alclad Primer. For the past three days I have been fighting the same paint-lift problem despite stripping and re-priming the wings twice. And it's always down to the plastic. The acrylic paint sticks to the Alclad no problem. The Alclad Primer just doesn't stick to the wings that well. Usually Alclad never comes off without sandpaper. But I can take it off the Roden plastic with either a fingernail or a nylon bristled brush. I've run out of ideas. Anyone got any? Thanks, Gaz Link to comment Share on other sites More sharing options...
1to1scale Posted February 25, 2018 Share Posted February 25, 2018 Try a hot primer, like Tamiya spray can type. Or automotive type, finally, the nuclear option is to decant some automotive adhesion promoter and spray that. Gazzas 1 Link to comment Share on other sites More sharing options...
Gazzas Posted February 25, 2018 Author Share Posted February 25, 2018 Try a hot primer, like Tamiya spray can type. Or automotive type, finally, the nuclear option is to decant some automotive adhesion promoter and spray that. Thanks for the reply. I figured that Alclad primer would be 'hot'. Maybe not. Gaz Link to comment Share on other sites More sharing options...
1to1scale Posted February 25, 2018 Share Posted February 25, 2018 (edited) Before you try that, try cleaning it with a caustic chem. Not sure what you have there, but here we have Bleech White, Purple Power, Simple Green, etc. soak at the parts for 15 minutes, then scrub with a toothbrush. That will get rid of any mold release agent. However, if you cleaned, sanded, and your paint flaked, then I suspect it's the plastic formula. You probably need to use adhesion promoter. Edited February 25, 2018 by 1to1scale Link to comment Share on other sites More sharing options...
Gazzas Posted February 26, 2018 Author Share Posted February 26, 2018 Thanks for the tip! I've got simple green and that worked great on the acrylic paint. Because it's a WWI plane, I can't sand very much because of the wavy structure caused by wood and canvas. I think what I'm going to do is sand the damaged areas as smooth as possible then paint with enamels and brush since the A/C were doped by brush at the factory. I have the base color enamels, so should be able to mix easily. Link to comment Share on other sites More sharing options...
Zero77 Posted February 26, 2018 Share Posted February 26, 2018 You can try degreasing the plastic with soap or dish soap just like some resin parts. I also encountered the same issue with some Special Hobby kits, and i think some short run kits companies use a kind of releasing agent or something. Gazzas 1 Link to comment Share on other sites More sharing options...
Radub Posted February 27, 2018 Share Posted February 27, 2018 (edited) The biggest problem with paint adhesion is grease/oil. I always degrease models before painting. Handling models will leave natural skin oil residue all over the model. I use a degreser spray made by a brand called Tec7, available from my local hardware store. Look for "Tec7 Cleaner". It does not attack paint or plastic. I spray it on, spread it with a brush and then wipe all over with paper towel or cotton buds in the smaller places. Wiping is important. I read on forums about people soaking parts in really aggresaive substances with "no good results". If the part is only soaked, then the oil/grease is just diluted and possibly spread over even more area. Wiping actually removes that oil/grease from the surface.Hth,Radu Edited February 27, 2018 by Radub Gazzas and Zero77 2 Link to comment Share on other sites More sharing options...
Zero77 Posted February 27, 2018 Share Posted February 27, 2018 The biggest problem with paint adhesion is grease/oil. I always degrease models before painting. Handling models will leave natural skin oil residue all over the model. I use a degreser spray made by a brand called Tec7, available from my local hardware store. Look for "Tec7 Cleaner". It does not attack paint or plastic. I spray it on, spread it with a brush and then wipe all over with paper towel or cotton buds in the smaller places. Wiping is important. I read on forums about people soaking parts in really aggresaive substances with "no good results". If the part is only soaked, then the oil/grease is just diluted and possibly spread over even more area. Wiping actually removes that oil/grease from the surface. Hth, Radu Indeed, simply soaking is not enough. I usually wet the parts with warm water, then scrub with soap and a toothbrush, and then rinse them with warm water and still the toothbrush. If my model is greasy after so much handling, before painting i rub it with a kitchen towel and some mineral spirit, as alcohol would attack some puttied areas. Link to comment Share on other sites More sharing options...
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