Colourfastness #3: Two Months in the Sunshine

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Blog entry by shipwright posted 01-31-2018 11:41 PM 1083 reads 1 time favorited 16 comments Add to Favorites Watch
« Part 2: One Month Check-in, .... some surprises Part 3 of Colourfastness series Part 4: Three Month Check In »

Well it has been two months now since I put my test piece out in the (winter) Az sun.
Not a lot has changed but a few things are worth noting.

1) There seems to be little difference between the epoxy alone and the two with ten coats of uv filtered marine varnish.

2) The shellac alone has dulled noticeably but it has been the strip to watch for interesting change.

2a) The Amaranth is still very much redder than te under the other finishes and still appears “lit up” from within.

2b) The Cherry has become veryred as well, as has the Mahogany.

3) Across the board the least changed of the woods is the Wenge.

4) Not much colour in the bare woods although the Wenge has remained fairly black.
....... just observing and trying to learn something.

As previously stated there are no goals in this experiment and nothing I’m trying to prove or disprove.

See you next month.


-- Paul M ..............the early bird may get the worm but it’s the second mouse that gets the cheese!

16 comments so far

View bobasaurus's profile


3530 posts in 3303 days

#1 posted 01-31-2018 11:45 PM

That’s a neat experiment. I hope to see it after a few years. I’ve been curious about the UV blocking qualities of spar varnishes.

-- Allen, Colorado (Instagram @bobasaurus_woodworking)

View rance's profile


4262 posts in 3279 days

#2 posted 01-31-2018 11:55 PM

Nice experiment Paul. We all should do some of this kind of experimenting. Thanks for sharing.


-- Backer boards, stop blocks, build oversized, and never buy a hand plane--

View Woodknack's profile


12336 posts in 2499 days

#3 posted 02-01-2018 12:14 AM

Thanks for the update, watching with interest.

-- Rick M,

View John Smith's profile

John Smith

1311 posts in 282 days

#4 posted 02-01-2018 12:41 AM

Thanks Paul for taking the time to do this and sharing.
I am particularly interested in the bare epoxy and high UV varnish results.

-- some people are like a Slinky - - - pretty much good for nothing. But still make you smile when you push them down a flight of stairs.

View NormG's profile


6233 posts in 3123 days

#5 posted 02-01-2018 12:56 AM

Very interesting to see how time changes things

-- Norman - I never never make a mistake, I just change the design.

View Mark Wilson's profile

Mark Wilson

2234 posts in 1182 days

#6 posted 02-01-2018 02:28 AM

I finished an outdoor yardart piece with spar varnish, several years ago. It completely failed and peeled after about five years.

-- Mark

View Jim Jakosh's profile

Jim Jakosh

21113 posts in 3224 days

#7 posted 02-01-2018 02:29 AM

Thanks, Paul!!


-- Jim Jakosh.....Practical Wood Products...........Learn something new every day!! Variety is the Spice of Life!!

View Jerry's profile


2742 posts in 1767 days

#8 posted 02-01-2018 03:23 AM

I’m following this with great interest, Thanks Paul.

-- There are good ships and there are wood ships, the ships that sail the sea, but the best ships are friendships and may they always be.

View tomd's profile


2165 posts in 3889 days

#9 posted 02-01-2018 03:39 AM

Interesting test. However from where I’m at I have not seen the sun for awhile. I would let you give me a coat of shellac if you would lay me out in the sun for a couple weeks.

-- Tom D

View Dark_Lightning's profile


3221 posts in 3228 days

#10 posted 02-01-2018 04:10 AM

I don’t remember where I read it; it may well have been here or in FWW Magazine. A guy found some wood doors in France that appeared to be unscathed by the sun. On closer inspection, they were metal doors painted to look like wood. Any finish one puts on wood is going to get beat by UV. But if one wants to use some of the more recent automotive paint products, one can get a finish that will last for decades in the sun.

-- Random Orbital Nailer

View Sodabowski's profile


2374 posts in 2952 days

#11 posted 02-01-2018 07:29 AM

The unprotected strip makes quite the bold statement!

-- Thomas - Pondering the inclusion of woodworking into physics and chemistry classes...

View shipwright's profile


8067 posts in 2917 days

#12 posted 02-01-2018 02:43 PM

Thanks for the comments. It’s fun to watch.

As this test is about colourfastness and not weather resistance of the finishes, I am going to re-coat the shellac strip.
The other strips all have outdoor finishes and I’d like to prevent total loss of the shellac.

-- Paul M ..............the early bird may get the worm but it’s the second mouse that gets the cheese!

View sras's profile


4874 posts in 3248 days

#13 posted 02-01-2018 10:06 PM

A riveting story with a fast moving plot :) and interesting as well!

-- Steve - Impatience is Expensive

View Dave Polaschek's profile

Dave Polaschek

2605 posts in 701 days

#14 posted 02-02-2018 12:36 AM

Thanks for doing this, Paul. It’s fascinating to watch.

-- Dave - Minneapolis

View Schwieb's profile


1866 posts in 3580 days

#15 posted 02-05-2018 11:48 PM


-- Dr. Ken, Florida - Durch harte arbeit werden Träume wahr.

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