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Colourfastness #4: Three Month Check In

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Blog entry by shipwright posted 03-06-2018 03:40 AM 755 reads 0 times favorited 21 comments Add to Favorites Watch
« Part 3: Two Months in the Sunshine Part 4 of Colourfastness series no next part

This will be my last report on the sample finishes in the Az. sun. I’m heading home to Canada this week but the good news is that I have a friend who lives here year round and he is going to keep the experiment going.

Things aren’t much different from last month but then the sun level wasn’t as high as usual in Az.

The shellac alone still seems to be the odd man out. It is the only one that has kept the purple in the Purpleheart (Amaranth) and the Cherry continues to be very different under shellac alone.

it will be interesting to see how the finishes do when the Az. sun ramps up the power as summer approaches.

Thanks for looking in.

Paul

Edit the order is bare wood, shellac alone, shellac with varnish, epoxy with varnish, and epoxy alone.

-- Paul M ..............If God wanted us to have fiberglass boats he would have given us fibreglass trees. http://thecanadianschooloffrenchmarquetry.com/



21 comments so far

View Dark_Lightning's profile

Dark_Lightning

3165 posts in 3135 days


#1 posted 03-06-2018 04:22 AM

Keep up the good work! This will take a lot of wind out of the sails from those who just make stuff up about wood and finishes.

-- Random Orbital Nailer

View Woodknack's profile

Woodknack

11804 posts in 2407 days


#2 posted 03-06-2018 04:24 AM

Cool test. Our sun is less brutal but it would be fun to conduct a similar test here but we also get rain so it would be a double whammy.

-- Rick M, http://thewoodknack.blogspot.com/

View gbear's profile

gbear

512 posts in 4126 days


#3 posted 03-06-2018 04:49 AM

Sometimes the old ways are still the best ways! Great test….looking forward to the next edition.

-- gbear, Carmichael, CA

View DocSavage45's profile

DocSavage45

8601 posts in 2869 days


#4 posted 03-06-2018 07:09 AM

Paul,

Thanks for posting. Be careful on the way back, we’re getting a lot of snow and the east coast is getting it too.

-- Cau Haus Designs, Thomas J. Tieffenbacher

View Andre's profile

Andre

1888 posts in 1833 days


#5 posted 03-06-2018 03:30 PM

I really do feel sorry for you having to return to our Banana Dictator Country! Why not bring some of the Heat up this way?

-- Lifting one end of the plank.

View shipwright's profile

shipwright

7992 posts in 2824 days


#6 posted 03-06-2018 04:09 PM

Thanks everyone. I’ll keep you posted.

Tom, we are flying now so the snow won’t be a problem.

Andre, ...... :-)

-- Paul M ..............If God wanted us to have fiberglass boats he would have given us fibreglass trees. http://thecanadianschooloffrenchmarquetry.com/

View Grumpymike's profile

Grumpymike

2263 posts in 2342 days


#7 posted 03-06-2018 06:02 PM

Looks to me like panel #1 at the left is bare wood, and I assume that panel #2 is the shellac coated … ??
Thanks for this experiment, quite enlightening (pun intended).

-- Grumpy old guy, and lookin' good Doin' it. ... Surprise Az.

View shipwright's profile

shipwright

7992 posts in 2824 days


#8 posted 03-06-2018 06:45 PM

Sorry Mike. Check back to the first segment of the blog. I’m not re-posting the original stuff each time. Maybe I should.

-- Paul M ..............If God wanted us to have fiberglass boats he would have given us fibreglass trees. http://thecanadianschooloffrenchmarquetry.com/

View sras's profile

sras

4811 posts in 3156 days


#9 posted 03-06-2018 06:51 PM

Thanks for the update. I’ll wave as you go by on your way home :)

-- Steve - Impatience is Expensive

View CharlieK's profile

CharlieK

555 posts in 3820 days


#10 posted 03-06-2018 07:48 PM

Thanks so much for doing this, Paul. It seems a bit counter intuitive to me that the purpleheart holds it color best under shellac, but most of the remaining samples under shellac seem more affected. Am I looking at this right?

-- Adjustable Height Workbench Plans http://www.Jack-Bench.com

View shipwright's profile

shipwright

7992 posts in 2824 days


#11 posted 03-06-2018 09:05 PM

You’ve got it Charlie.

It surprises the hell out of me too. What else surprises me is that epoxy with the high uv filter varnish isn’t noticeably different from the plain epoxy.
That “best under shellac” is also compared to the adjacent sample which is shellac with the varnish.
It seems that the fact that more uv is hitting the plain shellac is making the difference.

Yup, that’s a surprise.

-- Paul M ..............If God wanted us to have fiberglass boats he would have given us fibreglass trees. http://thecanadianschooloffrenchmarquetry.com/

View stefang's profile

stefang

15881 posts in 3361 days


#12 posted 03-06-2018 09:44 PM

Sun? What is that? seriously I’m surprised about the colorfastness of the shellac. Does this mean that no air is getting to the wood with shellac, but it is with the other finishes? I have some purpleheart in my shop and the surface has oxidised to brown since I bought it.

-- Mike, an American living in Norway.

View shipwright's profile

shipwright

7992 posts in 2824 days


#13 posted 03-06-2018 11:24 PM

I only supply data Mike. The conclusions are up to you. This certainly makes you think it is more about light than air contact however.

-- Paul M ..............If God wanted us to have fiberglass boats he would have given us fibreglass trees. http://thecanadianschooloffrenchmarquetry.com/

View Dave Polaschek's profile

Dave Polaschek

2209 posts in 609 days


#14 posted 03-07-2018 02:20 AM

Thanks for running this experiment, Paul. Safe travels!

-- Dave - Minneapolis

View Druid's profile

Druid

1769 posts in 2822 days


#15 posted 03-08-2018 04:21 AM

Interesting update, and I’m looking forward to the hot weather results.
Have a safe trip home.

-- John, British Columbia, Canada

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