When reading the plans and instructions for our kits you will almost always see us call out Squadron Green Putty. We love this product because it is a fast drying easy sanding filler that works as well with wood as it does with plastic. We use it to fill cracks, dips, and pits. It sands beautifully and will work with both polyester or epoxy finishes. Sold in 2.3 oz. Tubes.