cart SHOPPING CART You have 0 items

Discussion Forums

Search forums
Forum Index > Off Topic > Decking / house wood oil

Decking / house wood oil

13 Oct 2019
@ 10:24 am (GMT)

Nathan Foster

The following regards a DIY oil brew I made up a couple of years ago for oiling the deck and board and batons of our house. I applied it two years ago and have waited until now to report on its hardiness.

To create the oil, I used an old Norse long boat recipe but had to modify it a bit to get it to work. The result is a good oil that does not crack and it seems to have prevented mold over the two year period. Oil can be reapplied without having to strip (unlike modern acrylics). I did not want to use a regular oil because our decking boards are grooved and do not offer a smooth surface for modern sealers.

I water blasted the deck and house in spring, then let it dry into summer. While I waited for summer to set in, I experimented with my viking brew. When I applied the finalized brew, the deck and walls went brown due to the dark tar. But this soon faded and the deck and walls went back to their natural look. I have seen no signs of mold after two years. Ideally, I think this should be done every year but as suggested, we skipped last year.

The brew consists of:

2.5 litres boiled linseed oil.

1.5 litres turps (white spirits).

50 mls / grams of Stockholm tar.


I have found that the cheapest way to do this is to buy 20 litres of linseed oil from Mitre10 Mega, then 5 litres of Stockholm tar from RD1 or Farmlands (used to treat seedy toe in horses).

I mixed the Stockholm tar with about a half cup or more of thinners. If you do not mix the tar with thinners, it won't break down (turpentine won't dissolve it). The tar was used to prevent mold (and make the house smell like a gun shop).

Next, I poured 1.5 litres of turps into an empty 5 litre container. I then added the thinned tar. After this I added the linseed oil and mix it all together.

To apply the mix, I used a knapsack sprayer, being sure to clean it out thoroughly afterwards. On our timber deck and exposed timber cladding, I used nearly 20 liters of this mix.

I hope this DIY tip proves useful. I will add some key words below in case others are searching for this.

BLO, boiled linseed oil decking, boiled linseed and turps, boiled linseed and white spirits, pine tar and oil, DIY decking oil, home made decking oil, long boat oil.


13 Oct 2019
@ 02:37 pm (GMT)

Robert Kennedy

Re: Decking / house wood oil
Interesting about using Stockholm tar to prevent mold. Gun stock oil I have made from a popular recipe is to use boiled linseed oil, 2 parts to 1 part gum turpentine (not mineral turpentine ) Before boiled linseed was available you needed to boil the oil yourself on the kitchen stove (while the chef is away for the day) and add the gum turpentine without it all catching on fire.
Stockholm tar is a great substitute for anti-seize compound on bolt threads in severe applications. I once had to help change out a set of track rollers on a Cat D8 used in sand mining on the beach. I was dreading the process of removing the fastening bolts - 7/8"or 1" NC, without an air-impact gun to break them loose. But once they were broken free with a socket, breaker bar and pipe extension you could undo them with your fingers. My more experienced mate had been using Stockholm tar on all the fasteners on the equipment there. The bolts did not come loose either, in service, even with the vibration from running a dozer on hard sand.
13 Oct 2019
@ 02:47 pm (GMT)

Robert Kennedy

Re: Decking / house wood oil
Sorry if this is not quite on topic.
Boar Tar

Hunting with boar tar

A rich layer of tar on a tree trunk. That's all that's needed to attract boars. The boar tar signals to the boar that the tree is rich in resin, which wild boars use to remove parasites from their fur. By regularly using Auson's boar tar you can entice boars to your hunting grounds all year round.

The Internet is full of surprises for the ignorant. I've never heard of this.
14 Oct 2019
@ 07:11 am (GMT)

Nathan Foster

Re: Decking / house wood oil
Hi Rob, the tar sets to some extent. It will generally lock the thread on the tar bottle over winter, but with a bit of warmth, it loosens up. I can see how it would help to prevent both loosening and full seizing.

I tried the tar with our pet wild boar. He did not like it so much, shied away from it. We keep him parasite free but he still likes to have a rub and has his favorite posts etc to rub against. I applied the tar to a rub - no dice. Perhaps if he had a very bad itch (parasites) he might get the urge to rub against it.

I have also tried thinning the tar and applying it to the outer of a gun barrel. Worked well but its failry sticky, picks up dust easily. It works very well externally on our quad bike chassis but mud sticks to it. Best to finish with diesel / oil.
14 Oct 2019
@ 01:47 pm (GMT)

Paul Leverman

Re: Decking / house wood oil
When doing snow removal, we used to spray the inside of the dump box with diesel. Keeps the snow from sticking and building up in the corners, etc.
15 Oct 2019
@ 09:38 pm (GMT)

Thomas Kitchen

Re: Decking / house wood oil
very interesting.
i have used stockholm tar on tip of dogs tails when they have ended up with scab/wound on tip that just won't heal as they bang them on everything (outside dogs not sure you would want a dog with tar on its tail inside)

have also painted it on wooden kennels that dogs kept chewing on.

my grandfather being a diesel mechanic use to just use waste oil to treat lot of his outside timber, believe most of his fences was made from old truck parts shipping crates with few heavy coats of waste oil.
was english born but grew up in Scotland during the depression so not much was wasted with him


We are a small, family run business, based out of Taranaki, New Zealand, who specialize in cartridge research and testing, and rifle accurizing.