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.
Clear coat front door.
The best clear finish for an exterior door is 3 coats of clear epoxy followed with 2 3 coats of spar varnish.
With the clear coat the wood became much richer and glossier.
The most common kind of finish used on fiberglass doors is a topcoat known as clear coat.
Take a bristle or preferable an ox hair brush and brush the varnish on brushing in one direction going from dry to wet.
It is a mistake by some amateurs to use a pigmented finish which hides the effect of the stain.
This is a translucent finish which means that the staining of the door and any wood grain effect this brings out can be seen through the layers of finish.
Sand your door lightly with 220 sand paper.
Previous varnish only finishes only lasted 2 3 years.
Client has a new hickory door and jamb.
Brush on a single coat of primer with a wide paint brush covering the front and all side edges of the door primer prevents the door from absorbing moisture and helps smooth out its texture.
My front door a fiberglass prefinished door red mahagony color has the clear coat peeling from it.
Applying the clear coat took about 45 mins and we waited 2 hours for it to dry.
Depending upon exposure you are good for another two to twenty years.
I m glad we didn t stain the door beforehand because the clear coat brought out a much deeper color than i expected.
Clear coat ext door extreme sun so i should have turned this job away from the get go but i m committed and need to get it behind me.
I know i have to use a gel stain and thought there would be an equivalent to the minwax red mahogany i used for all the door trim around the door.
Tack it down with a rag soaked with paint thinner and a little varnish to make a tack cloth.
Buy two quarts of marine varnish one gloss and the other the sheen of your choice.
This house is on the top of a hill with.
I plan to scrape as much off as i can and then probably sand synthetic wool pads the rest off.
Going to go paint on the jamb so i m off the hook there but the door itself is supposed to be finished with a clear finish.
Then we flipped the door over and i repeated the process.