Best finish to preserve color of Purpleheart - Router Forums
 15Likes
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 18 (permalink) Old 01-25-2020, 09:03 PM Thread Starter
Registered User
 
TWheels's Avatar
 
Join Date: May 2006
Country: United States
First Name: Tom
Posts: 1,861
 
Default Best finish to preserve color of Purpleheart

I have some Purpleheart from which I intend to build gift boxes. I have looked into the topic far enough to learn that the deep rich purple color changes over time, especially after exposure to UV, and that the finish needs to be oil based.
My current thought is Minwax 40900000 Wipe-On Poly Finish Clear, as found https://smile.amazon.com/gp/product/...KIKX0DER&psc=1.

Your thoughts?

I Want to Be the Person My Poodles Thought I Am
The RouterForums member formerly known as mftha or th-alton
"Teach your children what we have taught ours, that the earth is our mother. Whatever befalls the earth befalls the sons of the earth. The earth does not belong to man; man belongs to the earth. Man did not weave the web of life; he is merely a strand in it. We do not inherit the earth from our ancestors; we borrow it from our children."
-attributed to Chief Seattle of the Native American Suquamish Tribe
  • Wood working, especially router work is too much fun to let "disabilities" get in the way.
  • see MEBCWD's signature line; be certain brain is properly powered up and engaged
TWheels is online now  
Sponsored Links
Advertisement
 
post #2 of 18 (permalink) Old 01-25-2020, 09:56 PM
Forum Contributor
 
Stick486's Avatar
 
Join Date: Jan 2013
Country: United States
First Name: Stick
Posts: 26,027
 
Default

keep it out of the light...
protect it from UV exposure...
Attached Files
File Type: pdf Why does wood change color.pdf (29.1 KB, 22 views)
File Type: pdf Color Stabilization of Wood and Durability Improvement of Wood Coatings.pdf (142.6 KB, 28 views)

This would have been the week that I'd have finished chewing thru the restraints...
If only new layers hadn't been added....

Stick....
Forget the primal scream, just ROAR!!!
"SNORK Mountain Congressional Library and Taxidermy”
Stick486 is online now  
post #3 of 18 (permalink) Old 01-25-2020, 11:06 PM
Registered User
 
gdonham1's Avatar
 
Join Date: Oct 2011
Country: United States
First Name: Guy
Posts: 230
 
Default

Unfortunately purpleheart will change to brownish over time no matter what you do. The more UV it gets the more it turns brown. I do not know of any UV inhibitors but you could see if any of the marine finishes have the UV inhibitor.
harrysin and Herb Stoops like this.
gdonham1 is offline  
Sponsored Links
Advertisement
 
post #4 of 18 (permalink) Old 01-26-2020, 02:15 AM
Moderation Team
 
Cherryville Chuck's Avatar
 
Join Date: Sep 2010
Country: Canada
First Name: Charles
Posts: 15,413
 
Default

Marine spar varnish is supposed to have uv inhibitors if that helps. I had some D fir that had beautiful shades of blue and purple in it, the only piece I had ever seen like that but unfortunately it faded out and wasn't so spectacular once it did. It never saw any direct sunlight.
Nickp likes this.

Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.
Cherryville Chuck is online now  
post #5 of 18 (permalink) Old 01-26-2020, 12:30 PM
Registered User
 
Nickp's Avatar
 
Join Date: Dec 2012
Country: United States
First Name: Nick
Posts: 3,789
 
Default

Varathane and Man o' War make a spar poly...specifically made for external masts and other wood...lots of UV inhibitors...

Epiphanes has the most gloss, if you're looking for that...

Nick

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
GIVE A MAN A FISH and you feed him for a day.
TEACH HIM HOW TO FISH and you feed him for his life time.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Nickp is offline  
post #6 of 18 (permalink) Old 01-26-2020, 12:48 PM
Contributor of the Month
 
PhilBa's Avatar
 
Join Date: Sep 2014
Country: United States
First Name: phil
Posts: 1,407
 
Default

The use of exterior marine finishes makes sense though I'd always thought that UV blockers were to prevent deterioration of the finish itself and not the bleaching of the underlying wood.

By the way, there is a FWW article in #205 (not sure when that was, pre-2009 for sure though) about a multiyear test of exterior finishes. They found that all the consumer "exterior" finishes were basically crap - lasted no more than a year - and that even among the pro finishes only Epifanes went the distance.

Measure twice, cut once and CROSS OUT THE WRONG MARKS.

Visit my shop website.
PhilBa is online now  
post #7 of 18 (permalink) Old 01-26-2020, 12:49 PM
Forum Contributor
 
Stick486's Avatar
 
Join Date: Jan 2013
Country: United States
First Name: Stick
Posts: 26,027
 
Default

Quote:
Originally Posted by Nickp View Post
Varathane and Man o' War make a spar poly...specifically made for external masts and other wood...lots of UV inhibitors...

Epiphanes has the most gloss, if you're looking for that...
soft and flexible too...

This would have been the week that I'd have finished chewing thru the restraints...
If only new layers hadn't been added....

Stick....
Forget the primal scream, just ROAR!!!
"SNORK Mountain Congressional Library and Taxidermy”
Stick486 is online now  
post #8 of 18 (permalink) Old 01-26-2020, 08:49 PM
Registered User
 
gdonham1's Avatar
 
Join Date: Oct 2011
Country: United States
First Name: Guy
Posts: 230
 
Default

Almost all lights emit some UV. So even though you do not put your project in direct sunlight it will always darken over time. Exotics like purpleheart are destined to turn brown over time. You may be able to prolong the beautiful purple/red hue but sooner or later it will turn. Even after the turn to brown it is beautiful.
Stick486 and Herb Stoops like this.
gdonham1 is offline  
post #9 of 18 (permalink) Old 01-26-2020, 11:39 PM
Forum Contributor
 
Herb Stoops's Avatar
 
Join Date: Nov 2014
Country: United States
First Name: Herb
Posts: 7,598
 
Default

I have used Waterbased Poly urethan and it still turns very dark almost black, the finish was supposed to have UV blockers in it.
Herb
Herb Stoops is online now  
post #10 of 18 (permalink) Old 01-27-2020, 10:40 AM
Registered User
 
Nickp's Avatar
 
Join Date: Dec 2012
Country: United States
First Name: Nick
Posts: 3,789
 
Default

Quote:
Originally Posted by Herb Stoops View Post
I have used Waterbased Poly urethan and it still turns very dark almost black, the finish was supposed to have UV blockers in it.
Herb

Herb, the marine finishes seem to work great on the teak on my boat...and it is in the sun all four seasons. After scraping all the old stuff I do a hand sanding then teak oil and then spar finish. If you haven't tried one of the marine spar finishes, grab a test piece/put some on and leave it outdoors through all weather. Not sure how it might work on Purpleheart...
Herb Stoops likes this.

Nick

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
GIVE A MAN A FISH and you feed him for a day.
TEACH HIM HOW TO FISH and you feed him for his life time.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Nickp is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Router Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome