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Old 05-22-2019, 05:48 PM
DChris DChris is offline
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Should I pre-mix retarder medium in new jars of paint?

I use 250 mL jars of acrylic paint (the Rheotech line from Tri-Art). I am thinking of mixing in 50 mL (20%) of retarder medium (also from Tri-Art) into all new jars of this paint. Would that be advisable? The instructions on the retarder medium recommends a ratio of 15-20%.
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Old 05-22-2019, 10:14 PM
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RoadLessTaken RoadLessTaken is offline
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Re: Should I pre-mix retarder medium in new jars of paint?

I wouldn't. There's a good reason the makers of paint don't do that automatically- not sure why but I wouldn't.

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Old 05-24-2019, 05:00 AM
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Patrick1 Patrick1 is offline
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Re: Should I pre-mix retarder medium in new jars of paint?

If you stay under the 20% limit, I can't see any reason why you can't. Try it in a small sample of paint to see how you like it (you could store it in a small jar). It will reduce pigment levels and opacity/coverage - but how noticeable it will be in actual use, you can only answer by trying & seeing for yourself. I mix retarder into the paint while it's on the palette, but pre-mixing it might be more convenient.

I'm not totally sure, but I suspect that student-level acrylics already have a lot of glycol retarder in their formulation...because of their soupy feel and slower dry time compared to artists acrylics.

Tri-Art's Heavy Body and Liquid acrylics are awesome but have never tried any Rheotech yet - how do they compare to other student acrylics?
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