I first start by cleaning the surface with acetone. Then I take some of the smooth-on epoxy that I glue up laminations with, and rub it all over my bow limbs and riser. Not much, glue is needed. Just rub it into the pours of the wood and sanded areas of fiberglass. Then wipe it off with a lint free towel used by automotive refinishers. After wiping the glue off let it dry overnight. Then apply your finishing products. Smooth-on epoxy makes a great filler sealer. I do this on all my bows. I've never had issues with any woods including cocobolo