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How to thicken paint
Buy a thickening agent.
You can buy a thickening agent for your paint from a local home improvement store. Most thickening agents for latex paint are made with water-soluble hydroxyethyl cellulose which works well with the latex.
Pick from:
(1). You may want to select a thickening agent that appeals to a specific type of latex or polymer you've used before. You can make your own thickening agent by taking approximately 1 cup (240 ml) of water and mixing it in with a pinch of salt.
(2). In addition, polyvinyl thinner tends to be stronger. Polyvinyl thinner is very good for coloring as it prevents streaks when the paint is applied.
(3). Make sure the thickening agent says it works with latex paint. Add the thickening agent to the paint.
(4). Choose a mold for your latex paint. If you want to create a fun latex painting, choose a mold that is easy to print.
(3).