[header] How to thicken paint [title] Buy a thickening agent. [step] 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. 
[substeps] Make sure the thickening agent says it works with latex paint. [title] Add the thickening agent to the paint.