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This morning I had a few detail parts that I wanted to paint with Tamiya Acrylic Khaki. I opened the botlle that I last used about a week ago. It was properly sealed & about 3/4 full. I decanted & thinned to my usual 2:1 paint/thinner ratio using Tamiya's proprietary thinner. Filled the AB cup, checked the compressor setting, fired up & began spraying. Spray was normal, but I noticed the paint looked wetter than usual. Checked all my settings, looked for any runs. Everything looked OK so I shrugged it off & finished the job. Cleaned the AB & noticed the parts still looked wet. Got a little concerned but waited for the paint to fully dry. After fully dry, I had the most beautiful, smooth, Glossy finish I've ever achieved. Problem is, I was spraying Flat paint & wanted a Flat finish.. The last painting session with the same paint & thinner came out dead Flat. No big deal as I can respray a flat top coat, but I've been wracking my brain trying to figure out what caused it to go Glossy. I don't use Acrylics a lot, but I have used Tamiya many times with no problem.
Anyone else ever experiemce this or have a theory as to the cause ??
Regards, Rick
I have had similar results with Tamiya paints over the 20 years I have been using them. The usual cause is not being stirred well enough. the older the paint, the more likely this is to happen in m y experience. With Tamiya paints, shaken and stirred, or stirred thoroughly with a stick.
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i dont know why maybe it is just a coincidence but my tamiya khaki always comes out glossy also..... weird
Wow, I've never had that happen before. Tamiya's Flat are about as flat as paint can get. I've had their gloss go flat due to too much alcohol, but I've never seen their flats go gloss. Are you SURE you stirred it well? Their flattening agents settle out pretty fast.
So long folks!
Different colors of paint within the same brand may use different flatting pigments, some of which settle faster in the jar, others of which tend to plate out parallel to the coating surface. The cause of both is almost always incomplete mixing, sometimes combined with too much reduction (thinner). In Rick's case, the latter was not a factor, based on his reported thinning ratio.
Low relative humidity can also play a rather peculiar role. Many flat pigments, especially those specifically for making a paint flat, have an electrostatic nature—the charge distribution on their surfaces is not uniform. When they are aerosolized by spraying, in a dry environment, static charge can cause them to align peculiarly with respect to the paint surface, especially with thinly applied layers or with a highly volatile solvent. Most often, this produces a glossier surface than would normally be obtained, but I've also seen it produce a nearly "flocked" surface texture.
That, or Rick just wasn't holding his mouth right………
Ross Martinek A little strangeness, now and then, is a good thing…
I stirred it in the bottle & again after decanting & adding thinner. I guess it's possible that I didn't stir it enough, but the same bottle was used about a week ago & gave dead flat results.
That is odd Rick and I can't add anymore than these gentlemen have already said.
This is why I always use my paint mixer every time I paint as it mixes more completely than anything I have ever tried.
Good suggestion Mike. I'm getting old & feeble, so maybe my manual stirrer doesn't have enough ooomph anymore .
rjkplasticmod I stirred it in the bottle & again after decanting & adding thinner. I guess it's possible that I didn't stir it enough, but the same bottle was used about a week ago & gave dead flat results. Regards, Rick
And the Paint Gremlins are giggling at you…
(Oh, they exist. Trust me. I'm an expert in these matters…)
They aren't giggling Ross, The're having a good old belly laugh .
I am using Tamiya thinner only with gloss paint and alcohol for the flat colors
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