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UV protective finish & melamine

J

Jay Coulson

Joined
Aug 22, 2009
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Hi All,
I have just made a trip to a local exotic woods store and, brought home a small bowl blank of purple heart for my daughter. She's very excited about the prospect of having a naturally purple bowl. However, I have had several people tell me that the vivid color will turn brown in fairly short order if i finish it in some "normal" manner...ie Linseed oil, beeswax, sealing sander, friction polish, various laquers, etc.
Now, I had one guy tell me that the only way to keep the color in tact was to use Armour-All..the stuff for your auto tires and dashboards. This was due to it's UV protective properties. Anybody ever hear of anything like this?

Also, how is melamine best used and, is it quick-drying? What are it's properties/virtues and applications? Would it have any value as opposed to the Armour-All?
Thanks,
J
 
Armour all doesn't work. I've tested it on other woods and on Photos. In fact I've tried a couple of UV inhibitive finishes on things like Box Elder and they probably help when not in direct contact with high UV sources but in direct sunlight, in 2 days to a week it kills the color in a lot of UV sensitive woods and removes the color from photographs in less than a month.
Purple heart on the other hand is not as sensitive as some other woods. It turns brown after you turn it but when UV hits it, it turns back to a nice purple. It takes several years for it to change any when kept in my house which is fairly light. My parents have one of my wine stoppers that has to be at least 5 years old and is still very purple. Can't say what other peoples experiences are.
 
uv and purpleheart

Thanks John,
You have the honor of freeing up my favorite screw chuck! I thought that I was going to have to leave this 6 inch gremlin on the screw until I got to the bottom of the UV issue and subsequent color change. Guess I'll just hit the profile with some sanding sealer and friction polish, flip it over and hollow it and make a 12 year old happy with a little purple bowl.
Then, on to making up stuff on my order list for the holidays.
Have a nice evening John and thanks again.
J
 
It also depends on the exact species of Purple heart. I have had some that had no problems and others that went brown rather quickly.

I have also heard it is photo chromatic. Meaning you some of them you can change the color with different light sources (then again I also heard you can change it by putting it in the fridge).
 
purpleheart uv etc

Hi Hughie,
I'm with John...where can I get some of that lignostab stuff? The purple gremlin bowl worked out fine altho, must admit thst it was a little tough to turn. An Australian friend told me that they use that stuff for pilings on boat docks because it's so hard and stringy. He recommended that I get a John Jordan tee-shirt that says something like "lifes' too short to turn crap wood". I am going to see if I can buy one from John. However, I've got about half dozen people who have seen this little beast and want one. So, I don't want to turn down a couple of hundred bux as it only took me about 20 mins to cut and finish the whole thing. Must tell you that I was spinning at about 1800 and maybe more to hollow it with a fresh edge on the gouge. Tuff stuff but, it finished very well.
J
 
Thanks Hughie. I just sent them an e-mail. Maybe I'll hear from them and find out where to buy some in the US.
 
From the reading I've done, you might want to check the links here, especially the Sample Request and the 12-page Lignostab 1198 Brochure.

Looking at the top of Brochure page 5, you'll see that

1) Ciba recommends supplementing the Lignostab using a UVA (UV Absorber) for interior use--or a UVA/HALS (Hindered Amine Light Stabilizers) combination for exterior (and I'm wondering possibly for "extra" durability), and

2) they've listed some specific solutions and products to combine with the Lignostab.

You might want to include one or more of them if requesting samples. While you've got the brochure up, also be sure to take a look at the images and performance data starting on page 9.
 
I got this in my e-mail. I believe it's a little too expensive for me to experiment with. At $21.25 per 44lb pail that comes to $935

Dear John,

I am with MF Cachat and we are Ciba/BASF’s distributor for your area. Your inquiry was forwarded to me from Ciba.

Lignostab 1198 comes in 44-lb Pail and 110-lb Drum. Current price is $ 21.25/lb FOB regional warehouse for both pail and drum packaging. Lead time is 4 – 8 weeks.

Attached is MF Cachat new customer credit application form and updated product line card.

Best regards,

Stephanie S. Chien
Account Manager, Internal Technical Sales & Technical Support

Phone: (800) 729-8900 Ext. 276
Fax: (216) 228-9141
e-mail: sschien@mfcachat.com <mailto:sschien@mfcachat.com>
Web: www.mfcachat.com <http://www.mfcachat.com>
 
friends

John, just coordinate 587 friends who pitch in $5 to receive .075 lb. of the stuff, make sure each follows directions for use

no problemo 😀
 
Geez! The small amounts of PurpleHeart that I've used for small stuff have responded well to heat...... burning in fricion polishes or just the friction from sanding. It seems to deepen or enrich the purplish color and seemed to be quite stable for me(2-3yrs.) but then the pieces didn't get exposed to a whole lot of sunlight. (They were kept indoors and not allowed to go outside to play at all!😀)

Maybe there are different varieties or species that respond differently, I don't know; but I've even heard of people putting the wood in their ovens to achieve the deepening of the color! I've never had to go that far so maybe they were just putting me on.😕
 
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