Pre paint water repellent, home made
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Victor



Joined: 07 Aug 2010
Posts: 35
Location: Pacific North West

PostPosted: Thu Sep 04, 2014 3:16 pm    Post subject: Pre paint water repellent, home made Reply with quote

I ran across this and thought I'd share.

It is a recipe for a wood preservative from the GSA.

http://www.gsa.gov/portal/content/113166

"But the most surprising result in the 20-year test was that window
units treated with a simple water repellent (1.5 percent paraffin
wax in mineral spirits plus 10 percent exterior varnish resin with
no chemical preservative) performed as well as did the water-
repellent preservative (which contained both wax and a chemical
preservative). This showed that a non-chemical water repellent
like paraffin wax with a small amount of resin, such as exterior
varnish, was capable of providing protection to wood exposed above
ground to the elements for 20 years in a northern climate.

A water-repellent treatment alone can provide excellent decay
resistance to outdoor painted woodwork without the addition of a
chemical preservative. This can represent a saving of money and
resources and judicious avoidance of chemical preservatives in
items such as windows, sheds, porch and fence rails, and other
above-ground wood products.

The water-repellent treatment is easily done before or after
construction and before painting. A simple formula, easily
prepared is:

- Exterior varnish 3 cups

- Paraffin wax 1 ounce

- Mineral Spirits, or
paint thinner, or
turpentine Add to make 1 gallon

Treatment is best done by dipping the wood for 1 to 3 minutes in
the solution. If dipping is inconvenient, liberal brush
application can be made - paying particular attention to heavy
treatment of all board ends and joints. The treated surface can be
painted after 2 or 3 days of warm weather. In fact, paint should
last longer over the treated surface than over untreated wood.
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johnleeke
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Joined: 20 Aug 2004
Posts: 2999
Location: Portland, Maine, USA

PostPosted: Thu Nov 20, 2014 2:12 pm    Post subject: Reply with quote

Victor, excellent, thanks!
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John

by hammer and hand great works do stand
by pen and thought best words are wrought
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TimB



Joined: 03 Sep 2009
Posts: 43

PostPosted: Sun Nov 23, 2014 9:23 am    Post subject: Reply with quote

Are paraffin candles pure enough to use in such applications or do they contain fillers that would make them unsuitable? Far easier to source paraffin candles locally, and avoid shipping charges, than to buy paraffin online.
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Tim Brosnihan
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johnleeke
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Joined: 20 Aug 2004
Posts: 2999
Location: Portland, Maine, USA

PostPosted: Mon Nov 24, 2014 10:31 am    Post subject: Reply with quote

Tim, I've always found paraffin marketed for food canning. It's been a couple years since I've bought some locally, here in Portland, but I'd call Maine Hardware first.
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John

by hammer and hand great works do stand
by pen and thought best words are wrought


Last edited by johnleeke on Wed Nov 26, 2014 11:11 am; edited 1 time in total
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TimB



Joined: 03 Sep 2009
Posts: 43

PostPosted: Tue Nov 25, 2014 8:19 am    Post subject: Reply with quote

Thanks John, I will check that out. I've always been interested in mixing my own, but got hung up a bit on a substitute preservative for the original Forest Products Laboratory recipe. The idea that mixing an effective water repellent can be done with such readily available ingredients is exciting.
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