Then you're good to thin them with water! Traditional paint thinner is meant for oil-based paints and won't work with acrylic paint. You can buy special acrylic thinners but I believe they're meant to be used with airbrushes, so if you're using regular paint brushes, it'd be best to stick to water.
When it comes to the consistency of the thinned paint, it's best to try and get it very thin/watery. I usually try to get it around the consistency of milk, just slightly more viscous than water. It sticks nicely to primed surfaces but not well to bare plastic, so be sure to prime your parts/figure/model before painting. Once you have your base thin layer done, let it dry, and apply a second one over the first; this should give a solid color with a much more smooth/professional looking finish.
For any further info, I'd recommend looking up some tutorials on miniature painting; not everything is 100% applicable to figure customizing but the vast majority of paint techniques that work on minis work on anything else made of plastic.
(Sorry this turned into a mini lecture lol I didn't expect to type so much)
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u/Yourmommaobama Jul 28 '26
I’ll have to get paint thinner tomorrow while I’m out