Wooden doors may look great, but if not protected in the correct way then the door may not last as long as you would like due to elements outside of your control. Weather being the main one. So what are we hinting at here? Well we recommend finding the right coating for your door.
Spar varnish is the right type of coating to use, but apply with a brush and not spray. Spar varnish will give your door the best clear coat protection against water, whilst also protecting against other elements. If your coating becomes to thick then the coating will have to be striped.