Colourfastness #3: Two Months in the Sunshine

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Blog entry by shipwright posted 01-31-2018 11:41 PM 478 reads 1 time favorited 15 comments Add to Favorites Watch
« Part 2: One Month Check-in, .... some surprises Part 3 of Colourfastness series no next part

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 ..............If God wanted us to have fiberglass boats he would have given us fibreglass trees.

15 comments so far

View bobasaurus's profile


3377 posts in 3090 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


4256 posts in 3066 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 Rick_M's profile


11112 posts in 2286 days

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

Thanks for the update, watching with interest.


View John Smith's profile

John Smith

445 posts in 69 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.

View NormG's profile


5901 posts in 2910 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

2062 posts in 969 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

20091 posts in 3011 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


2552 posts in 1554 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


2126 posts in 3676 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


3068 posts in 3015 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


2372 posts in 2739 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


7895 posts in 2704 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 ..............If God wanted us to have fiberglass boats he would have given us fibreglass trees.

View sras's profile


4749 posts in 3035 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

1543 posts in 488 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


1852 posts in 3367 days

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


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

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