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There is a product called floating medium that you can purchase where you find craft paint. It will make your paint more transparent, but will slow the drying time some what. Golden paints has extenders, at least I think they do. Their products are excellent. They also make slow drying acrylics.
michal3michalHeaps of extender products for acrylic paint here...https://www.artnews.com/art-news/product-recommendations/best-acrylic-paint-extenders-1202692652/Denis