MarcNewitt Posted October 4, 2015 Share Posted October 4, 2015 Hi everyone, I recently applied a matt acrylic varnish to my submarine stand and it has turned the paintwork misty, can anyone explain to me why this has happened and how to avoid this reaction in future? I am just glad it was the stand and not the submarine itself I sprayed. I usually finish my models in a coat of Klear but wanted a dull finish and never used matt before. The one in question is the Humbrol Matt Coat from a spray can. Any help would be fantastic. Marc Link to comment Share on other sites More sharing options...
Black Knight Posted October 4, 2015 Share Posted October 4, 2015 The white affect is the matting agent. The stuff which makes matt paint & varnish matt. Its appears on your job mainly usually because its not mixed thoroughly. However I've seen a number of calls like this on this forum about the spray can. It may have too much matting agent in it. If its the acrylic version; You could try coating the stand with meths or another alcohol to soften it, then coat it with Klear, which should absorb the excess matting agent. Then give it another final coat of a matt varnish - but not that Humbrol one. If its the enamel version, try giving it a coat of very thinned enamel gloss varnish, to absorb the matting agent. Then finish as above. 1 Link to comment Share on other sites More sharing options...
Bear Paw Posted October 4, 2015 Share Posted October 4, 2015 I have had the same reaction but it was on my model. The solution that I found to work is to never use Humbrol Matt acrylic varnish again. It seems to have cured it. 1 Link to comment Share on other sites More sharing options...
Deadman Disciple Posted October 6, 2015 Share Posted October 6, 2015 If its the enamel version, try giving it a coat of very thinned enamel gloss varnish, to absorb the matting agent. Then finish as above. If you use the Humbrol Mattcote in the the little 28ml glass jar, you need to give it a bloody good shake, as the matt seperates & collects at the bottom of the jar. 1 min in one hand, then swap over to the other hand for another minute. Link to comment Share on other sites More sharing options...
Mike Posted October 6, 2015 Share Posted October 6, 2015 This can happen as a bottle gets toward the end of its useful life. Even with proper shaking, the matting agent tends to fall to the bottom, and every time you draw off some varnish from the surface, the mix gets stronger, and more prone to that dusty, milky look. I had it happen with some Vallejo matt, which was great throughout the first 2/3 of a bottle, but had to go in the bin after it almost ruined my 189. you can recover to a greater or lesser extent by re-glossing the surface, but stripping it off is the only 100% fix. Link to comment Share on other sites More sharing options...
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