First get some VO cork grips. You'll also need a small can of amber shellac from the local paint store. While at the paint store, also pick up a disposable brush, but get the biodgradable wood type, not plastic.
Shellac is a resin secreted by the female lac bug, on trees in the forests of India and Thailand. It's made into flakes that are mixed with alcohol to make a varnish-like coating. You can buy flakes and mix them yourself, but for this little project I wouldn't bother.