Wood Preservatives

From DIYWiki
Revision as of 21:40, 7 March 2008 by (talk) (ounotasitda)
Jump to navigation Jump to search

i broadcast videos lfo every other time music video malia jones metoprolol 125 delicious everyday italian recipe simple repo man vulnerability check disabled paris airport transfers hardcore teen sex gas tank cleaning en language team turned wine distributors http crazy sex arthroplasty knee total video costa rica resort jessica andrew video lost horizon movie poster summer coloring book pages country kiss mp3 shania twain version when elaine dancing video acer extensa 500t video driver adagio barber free live webcams kissing a fool movie power steering lose control music video for myspace container edible food fresh garden growing in small space website home elefante home mike movie xxx engine repair small video equipment remote surveillance video clie sony tj27 ann code loft promotional taylor latin mamadas video rodney orpheus free wood working plan website video editing guide enable proscan rca s tv video in movie new release store north carolina outer banks rental property kongfu movie vinyl flooring amateur swinger jans video editing aventura code music video lost and delirious movie review stupid animation sitemap effect evil good lucifer people turn understanding internet adult movie downloads deserio arabxxx video interstitial cystitis bra cup open auntie bobs amateur gay videos american badass video performance truck parts inauguration video streaming weight loss program johnnie degiuli video antone smith video alpaca slippers webmap orlando international airport 2046 leung my wife wet pantie pit carts australian embassy address adrian brody new movie inside mind offender predatory rapists sexual akira lane video clips in movie temecula senator john mccain evil angels videos webmap jamie fox music video link jennifer convy engineering colleges in the usa www movie sex jujitsu america home audio video suppliers in bahrain ray-ban seattle center opera house scottsdale lodging japanese import video games azureus movies used furniture for sale adobe acrobat distiller free download texting http oxford pennsylvania celtic designs racecar classifieds link kings of convience video in it kiss like lyric movie they epidermolysis bullosa loews movie theater boston common part salvage used yard boccioni forme uniche indy 500 crash video new york sitemap cut style 24 days later ameatur movie jaws movie stills viking range multi media packaging arabic movie on the net atomic bomb video amazon movies uk laptop case lesbian kiss videos womens watch receptionist asian movie daily jerk off video jam jame music video health canada statistics ashley simpson booed off stage video say anything movie quote the book of coming forth sitemap soloflex part art grapics picture video writing alabama football video ling movie tia 5.8 ghz phone system with 3 handsets wrangler jeans web text to speech maker unexpected error live song tamil video fix registry saturnalia by paul muscle man lack of comprehension video atlanta grape video clip ashlee drunk simpson video free country music guitar tab joan laurer sex video garden hose extension hot sex com mothers day prayer extreme movies download adp web cam hot page anonymous proxy home engine f1 video campground anime game mp3 music video finding match perfect apex video game system play station 2 memory card we like it black.com kdv boy video domain lyric movie scary kataklysm videos page recto verso furosemide casino english harbour online review apple movie trailers quicktime all worlds video inc nigerian girl online website 2003 recipient policies volkswagen polo compare cost of living between two city forever flashlight wireless gps for pocket pc sport exige lotus amos andy download free n video teaching uncle toms cabin domain lorissa mccomas movie 120 alcohol party hardcore all jacked up music video bad consolidation credit debt load luciana paluzzi movie posters dancing joanie laurer sex video free leadership secret of attila the hun map john ramey naked disney toons india arie music video lilo and stitch movie pictures asphalt drum plant dryers laurel and hardy video clip anime music mp3 Most exterior woodwork needs treatment to prevent or delay rot. The main treatment options are given.


Water based Preservative

Water based preservatives have become popular due to lower cost per gallon. However this is only part of the story.

Water based preservatives have a very short life, and typically need recoating every year. This means an annual travel to the diy store, money spent, and time spent recoating the woodwork.

They are also not as effective as spirit based products, and will not effectively prevent rot in wood constantly exposed to water, such as fence post bottoms and earth retaining woodwork (eg bed edging, raised beds, compost containers).

Spirit based Preservative

Spirit based preservatives last multiple years from a single coating. This makes spirit based preservatives a much lower cost option than water based, even though the cost per gallon is higher.

This also makes spirit preservatives the more energy efficient option. Although the per gallon energy input is higher, many less gallons are used, due to less frequent application. Less transport & human travel is also needed, further reducing energy consumption. The reduced frequency of painting also means much less human time & energy input.

Oil based Preservatives

Used engine oil mixed 50/50 with paraffin or diesel has long been used as a wood preservative. It is very effective, but there are now concerns about the possible toxicity of contaminants in used engine oil.

New engine oil does not contain engine contaminants, and a new oil & paraffin mix will be discussed here.

  • Fully effective
  • Long lasting - many years
  • Low cost - typically around £3-4/gallon retail
  • Safe to handle
  • Preserves wood in constant contact with wet earth


There are 3 drawbacks, all of which are temporary, and disappear in the days following application.

Temporary Oiliness When initially applied it creates an oily surface. Within a day this soaks into the wood, leaving a dry surface.

Flammability concerns Like any spirit based product, an oil & paraffin mix is flammable. However it can not be readily ignited like petrol. Neither diesel nor engine oil will ignite when a naked flame is applied, and nor does a paraffin & oil mix. Paraffin is more flammable than diesel, but quickly soaks in then gradually evaporates away. Wood so treated does not become an increased fire risk, the prime problem is public perception.

Whiff Paraffin creates a very mild whiff as it evaporates. This is temporary & harmless, though it lasts for many days. This makes it ill suited to indoor use.


The paraffin can be substituted with diesel, kerosene or heating oil, but not with white spirit or petrol. White spirit is not effective, and petrol is dangerously flammable & toxic.

Don't use engine oil alone. Some oils soak in well, but engine oil sometimes does and sometimes doesn't.


  • Alkyd oil paints (household gloss paint) last a few years
  • Keeps water off wood, but does not provide any anti-rot chemicals to the wood.
  • Different chemistry to oil based preservatives.


Stockhom tar is smoked cooked pine resin. Tar waterproofs as well as preserves, and is thus a good choice for the bottom underground sections of wooden fence posts, and the ends of joists where inserted into masonry.

Expert article on Tar

Liquid asphalt

A sprayable diluted asphalt.


Tung oil, danish oil, boiled linseed oil etc


Creosote is the most effective and long lasting wood preservative of all. However it has downsides:

  • Smelly, almost stinky
  • Filthy
  • Permanently stains clothes, carpets, paving etc
  • Toxic
  • The fumes from application kill most plants within a radius of many feet.
  • Smell & plant deaths can lead to neighbour disputes
  • Now banned for home use.
  • May be legally applied by professionals
  • Available from trade outlets, but not DIY sheds

Application Tips

Thirsty Ends

Cut ends of wood are the most vulnerable to rot due to higher porosity. Repeated coating or preferably soaking in preservative can extend life.


The more preservative you can get into the wood the longer it lasts. Soaking wood in presrvative is therefore common. This can be done with a large container, or by standing the cut ends of wood in a bucket of preservative.

It can also be done by wrapping polythene sheet under the wood, supporting all the edges above the top of the wood, and filling with preservative. This minimises container volume, and is good where a minimal quantity of wood needs treatment. Before use check your preservative does not melt the polythene.

Dust sheets

Preservatives stain paving, so dust sheets are useful. Newspaper absorbs spilt preservatives and helps reduce spread due to treading. Waterbased stains are the least problematic in this respect, as the stain soon fades and disappears.

Indoor use

Use of non-water based stains indoors may in some cases produce concentration of fumes high enough to be an immediate risk to health. Check the label.

Durable Woods

Some woods don't need preservatives for outdoor use. These include:

  • Oak

See Also