Ah Gesso! You're going to become quite familiar with this product. Not only does it protect the board, but it also preps the surface to be painted on. It prevents the wood from drinking in all the paint, and helps stop any oils or glues from seeping through to your finished surface. It also gives a good tooth for which your paint to stick. Once the board is thoroughly dry from the previous layers of GAC-100, I give it about 3-4 coats of gesso. This product comes in black too, which can create some great effects depending on what you want to create (see Green Iguana and Dwarf Caiman in the Portfolio section for example). You can also add other acrylic colours to it, making any colour you want for a background to paint on. Just like with the GAC, make sure to alter directions with each coat to prevent warping. Also, if you're using Masonite and your board is larger, do both sides with the same amount of coats. It's important to make sure that your coats are spread evenly and that they have dried between each. Once that 3rd or 4th coat is dry, I give the board a light sanding. You can just use some handheld sandpaper, but I like to use my electric sander (just easier that way but it's up to you).
Once you're sure that your surface is nice and smooth, give your panel 1 or 2 more coats of gesso, coming up to about 5-6 in total when done. This will ensure that your board is really well protected, prolonging the life of your painting. Now we are ready to paint!
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