I use Amsterdam acrylic paint to paint my structures. The paint is quite thick. After a while, it thickens even more, making it difficult to spread. I use a wet sponge to dampen my paintbrush slightly; this prevents the paint from becoming too thin and makes it easier to spread.
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Ohhh, nice tip! Thank you @Liset 
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@Wenbare your welcome 
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A really good tip! Thank you!
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Your welcome @old_arcture