There are three basic clear finishes for outdoor furniture.
Clear coat for exterior wood door.
Of the three clear exterior finishes exterior oil is by far the simplest finish to apply.
At the surface of the wood uv breaks down the glue called lignin that holds the wood fibers together.
Exterior oil exterior varnish and an epoxy sealer with an exterior varnish topcoat.
Through a process called photo degradation ultra violet uv radiation damages the wood and the finish.
The other option is wood boat bright work and use spar varnish but realize boat coatings are made to be removed and renewed periodically so the same will happen to your door.
Either by forming a hard film over wood or by penetrating it.
Homeowners often wish to show the beauty of quality wood on exterior doors and trim with a clear finish.
They provide a natural appearance with a variety of satin semi gloss and glossy sheens and are ideal for kitchen cabinets doors furniture and floors but not recommended for outdoor use.
The film forming products both classic varnishes and modern urethanes are unmatched in their ability to bring out the beauty and depth of a wood surface while guarding against wear and tear.
Clean the door and coat it with sikkens and a foam brush and wait for it to dry.
Depending upon exposure you are good for another two to twenty years.
Protecting the finish and wood from uv light choose a high quality long lasting clear finish for your beautiful exterior hardwood doors.
This can cause problems if you apply the wrong type of polyurethane.
Application ease and service life are the two major differences between these finishes.
Polyurethane is the most durable of clear exterior finishes.