Ronseal yacht varnish is a professional high quality solvent based varnish that provides superior long lasting protection for exterior wood the weatherproofing formula protects the wood from damaging uv rays it contains a flexible resin that allows the varnish to move with the wood as it expands and contractsso helping to prevent cracking peeling and blistering this unique formula is also highly water repellent to keep your wood drier areas of use exterior approx coverage 16 m2 covered per litre