You should also know that if you plan to stain or varnish the project after your putty job
, you should take special care to sand down ALL traces of the putty to the outside of the hole. Any lingering films of glue will prevent proper penetration of the wood by the stain or varnish, and will consequently leave an ugly discoloration. One last tip to get you the best results: Make sure your counter-sunk screw holes are as aligned as possible and not just randomly placed. This will help everything to look uniform.