Whitewash Paint Diy . Here is how to do it: If you can’t get your hands on authentic masonry lime, this will do in a pinch. Mermaid Tail DIY Paint DIY PAINT CO. from diypaint.co Starting with a very small amount of the whitewash mixture on a paintbrush, brush in the direction of the wood grain. You’ll have to be sure that you don’t use the type of lime that you use in your garden. So, if there is a sealant on the wood stain, you need to strip it with a paint stripper.