Varnish vs Polyurethane | Difference Between Varnish and Polyurethane

Varnish

Polyurethane

• Varnish is produced from oils, resins and solvent. Mixtures of these in various ratios create various kinds of Varnish.

• Polyurethane is basically oil based or water based plastic resin.

• Varnish dries slowly once applied on the wood. In normal weather conditions, it takes around 6-7 hours to dry completely.

• Polyurethane dries in a little slower pace, if it is oil based. However, water based polyurethane dries at a quick pace under normal weather conditions.

• It is lesser durable though it is good against UV rays.

• It is highly durable though it has a poor performance to display against UV rays. It acquires cracks so easily if exposed under sun constantly.

• Varnish is applied through brushing and for applying it properly several layers of coating have been required.

• Polyurethane is easy to be applied in comparison with Varnish. Not many layering is required for applying – two to three layers would be enough.

• Varnish is little toxic though it is mostly considered to be safe.

• Polyurethane is considered as highly toxic, especially water based polyurethane has high toxicity to display.

• It is considered as traditional wood coating or finish. It is cheaper than new types of wood finish.

• It is expensive, but cost effective. You do not need to put 5-6 layers of coating – only 2-3 coating will be enough.

• It is mostly used for finishing outdoor wooden furniture as it is good to protect UV damages.

• It is not used for outdoor purposes. It is mainly used for indoor wooden furnish finishing purposes.