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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.
Choices: [i] 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.. [ii] In addition, polyvinyl thinner tends to be stronger. Polyvinyl thinner is very good for coloring as it prevents streaks when the paint is applied.. [iii] Make sure the thickening agent says it works with latex paint. Add the thickening agent to the paint.. [iv] Choose a mold for your latex paint. If you want to create a fun latex painting, choose a mold that is easy to print..
[iii]