Wood Finishes

What is the best clear coat finish to put on your wood sign?

Well, it depends on a few factors but let us try to get you an answer.

Will it be outside in the rain, snow, and sun? Will it be outside but under cover and little to no direct sunlight? Is low maintenance important? Is it important to you that the clear coat is “clear” and does not tint the wood orange?

Here is a list a few different clear coats that are often used for signs.

• Water based polyurethane

• Water based spar urethane

• Oil based spar urethane

• Penetrating oil

• Shellac

• Varnish

• Epoxy Resin

The best two types of clear coats for wooden signs that we’ve tested for outdoor use are:

1. Oil based spar urethane – Build up multiple layers of this clear finish to help preserve the color of the wood. It will yellow some and it will need re-coated every few years but it’s better than most of the alternatives we’ve tested.
2. Penetrating oil – A couple coats of a penetrating oil will soak into the wood and repel moisture while retaining a nice natural look. Re-coat every few years to keep the wood from turning grey and dark. UV protection and mildew resistance are good things to look for when choosing a penetrating oil. One brand we like is Ready Seal.

The major difference between the two options is that one sits on top and looks like a clear film and the other penetrates into the wood and therefore will not flake off if maintenance is neglected.

For indoor use we prefer:

1. Water based polyurethane – It’s easy to apply and give a nice protective clear finish.
2. Oil – We like teak oil, or Danish oil, or Odies Oil for an easy wipe on natural finish.

For building up a thick clear coat for interior signs we like to use an epoxy resin such as Dr. Crafty or West System.

There is a vast rabbit hole of information out there but hopefully this at least gives you a starting point. Have a look at some of our wooden signs to see clear coats in action.