Your best bet is to sand the door down and finish it with multiple coats of an exterior spar varnish that s made for boats.
Exterior wood door tung oil.
Choose the best oil for wood doors.
It also requires annual reapplication.
Finishing tung oil behr brand tung oil interior exterior with uv absorbers 1.
Allow all wood surfaces to fully dry before proceeding.
Use it as a raised garden bed deck fencing or pergola wood finish.
Keep the natural look of your wood while protecting it from the elements with this oil treatment.
Also works well on concrete stone or any absorbent material for exterior finishing.
The best oil for wood doors varies depending on wood type but the best brands will consist mainly of either tung or linseed oil or a combination of both.
Pure tung oil oil varnish blends and wiping varnish.
Tung oil is a major component of varnish not synthetic varnish but traditional varnish.
This exterior oil is made with 100 pure tung oil pine oil and zinc.
After the door has been sanded and cleaned apply stain to the entire door.
Penetrating tung oil finishes come in three varieties.
Experiment on a scrap or the butt edge of the door.
This category of exterior wood finishes brings out the color of the wood gives it a natural look for a short time before it starts to weather and turn grey.
As i mentioned before one of the best uses for exterior oil is outdoor wood furniture.
They all share the benefits that tung oil imparts to a finish durability water resistance resilient hardness and color stability depending on how much of the oil they actually contain and what form it takes.
The uv rays and heat from direct sunlight not to mention rain snow and extreme changes in temperature are very hard on exterior wood doors especially those with clear finishes.
Teak oil tung oil and tung oil finishes teak oil is a type of finish marketed for this popular outdoor wood.
This includes the bottom and top of the door and even the areas where the glass will be installed.
A pressure washer can be used if needed but low pressure should be used.
In fact it s one of the only finishing options that won t leave you grieved.
Exterior oil doesn t impart much colour to the wood and it can t hide areas that have gone grey and discoloured.
For the best exterior wood door maintenance clean it once a week and for metal and fiberglass doors clean at least once monthly.