Seal with a wood sealer labelled suitable for cork, to prevent penetration by water or grease, both of which will damage it. Avoid use of sharp objects which will gouge it.
The tips, hints and ideas at TipKing are vetted prior to publishing however some methods remain speculative in their own nature; therefore the information should be used responsibly and at your own discretion. The Information is displayed on an "As Is" basis, without warranty. Full disclaimer
