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topic 7352

Seeking Sprayable Iridescent Paint


A discussion started in 2001 but continuing through 2019

2001

Q. To whom it may Concern,

I am looking for an iridescent paint to paint on metal. I am not faring too well with a spot to start. I have contacted some of the powder paint suppliers and they don't have what I want. I need to be able to spray this on with an air gun.

Please respond back to me as I would love to try some of this out or find a supplier that would carry this paint.

Thank you

Mert W [last name deleted for privacy by Editor]
- Praire du Chien Wisconsin


2001

A. Dear Mert,

One good way to achieve an iridescent look would be to topcoat with a clear lacquer and put lots of thinner in the mix. This will cause the rainbow effect you are looking. If you are looking for a metallic coating to achieve this effect, you can take a look at our website, then contact us via email or call us. Hope this helps,

Sincerely,

Jake Koch
G. J. Nikolas & Co., Inc.
supporting advertiser
Bellwood, Illinois
nikolas banner ad


2001

A. There is a type of paint called Chroma-lusion (Dupont), Kameleon [linked by editor to product info on Amazon] and others (PPG, Sherwin Williams). It changes through five different colors and they have about 60 different combinations. cost is about $40/2 oz. Any automotive paint supplier should carry it. Has to be seen in person to get the full effect.

One manufacture supplies the plates to all the paint makers.

David D [last name deleted for privacy by Editor]
- Rochester New York USA


adv.
House of Kolor Kandy Red

2002

A. Try House of Kolor =>

I'm not sure what you mean by iridescent but these people will have it. Good Luck, --Tony

tony thomas
- Spring Green, Wisconsin USA


April 5, 2008

A. There is a company which specializes in very colorful car paint. It has a line of sprays in all sorts of dichroic colors. A sample kit is around $100. Their name is Alsa Corp.

Anne Y [last name deleted for privacy by Editor]
- Bellows Falls, Vermont


2007

Q. I'm working on a project for my chemistry I, and The title for it is "How Does Iridescent Paint Work?" I've looked up on many different websites and was hoping that you would be able to help me out! Thank you so much!

C-C L [last name deleted for privacy by Editor]
student - Madison, Wisconsin, Dane County


adv.
Carnival Glass: The Best of the Best
from Abe Books

or

2007

A. I can't speak for a given manufacturer about how their paint works, C-C, but Jake has told you how it is generally achieved (very thin layer of clear coat lacquer), and I can point you to info about the general principle of iridescence -- which applies to oil sheen on water, the rainbow colors reflected off a CD or DVD, the funny pink-green-purple colors you see in some new automotive headlights, and the many other cases where you see rainbow like reflections.

Iridescence is also seen in carnival glass. Good luck.

Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E.
finishing.com - Pine Beach, New Jersey
Striving to live Aloha


July 8, 2008

adv.
Iridescent Effects

A. They add pearl dust to paint to get the effect.

Ryan Turcot
- Ashcroft, BC, Canada


December 4, 2015

A. Another manufacturer for special effect paints, especially dichroic effect is Stardust Colors SAS, St. Laurent, France, stardustcolors.co.uk
They propose a few dichroic effects:
- prismatic (create a rainbow reflection), available in particles size from 200µ to 12µm (that is the size of a blood cell)
- chameleon paints (creating color changing effects - from 2 to 5 colors) depending on the angle of view

PEREZ GUILLAUME
ARCO IRIS - ST LAURENT, FRANCE



January 4, 2019

Q. Hi,

I know this thread is very old, but I'm desperately searching for a truly clear iridescent coating to restore glass antiques. I'm not looking for the color-changing metallic look like on auto paint that most people today consider iridescent.

Your comment about thinning lacquer caught my attention as most likely to be what I'm after. But could you be so kind as to be more specific? Such as, is it nitrocellulose lacquer? Or acrylic / water based? Some other type?

And is it actually lacquer thinner I should use, or some other solvent like acetone? And what target ratio of lacquer to thinner are we aiming for? 1:3 or 1:5 or 1:10 or what?

Your kind advice will be very much appreciated, thanks!

Jerry McDonald
Brazos Valley Antiques - Waco, Texas USA



November 11, 2019

Q. I know many people have been asking questions to learn process, techniques and find coatings for creating iridescence on this forum.
I have also seen some experts have suggested lacquer with a lot of thinner creates iridescent coating... I would like put forward results of my experiments.
Lacquer: Lacquer thinner
1:1 does not cause iridescence
1:2 does not cause iridescence
1:3 does not cause iridescence
1:4 does not cause iridescence
1:6 does not cause iridescence
1:6 does not cause iridescence
Lacquer: Paint Thinner
1:1 causes lacquer to lump up, and is not even soluble...
If anyone has any better suggestions please post them here.

I have pictures of my experiments that I would like to post but don't know how.

Harry Udhwani
- St Thomas, US Virgin Islands

----
Ed. note: Email photos to mooney@finishing.com for posting here.


January 23, 2020

A. Hello Jerry McDonald!

I don't know whether you ever found an answer for your question about iridizing glass.

Firstly, just in case:
-- Iridescence is caused by the refraction of light through "micro-prisms" (my word) formed by structural unevenness of the surface of a material that cause the light to bounce around in a way that breaks white light into its visible constituent wavelengths.
-- Attempts to reproduce that effect seek to duplicate those "micro-prisms".
-- TRUE iridized glass is made by coating the still-hot glass with metal salts, and then giving the glass a final firing to create the refraction, i.e. the iridizing effect, by disturbing the surface enough for "micro-prisms" to form. The crystalline nature of the micro-structures is critical to the extent and quality of the refraction.
-- To be honest, as a glass artist, it seems to me that "painting" the glass parts of antiques would be analogous to dipping a coin from Ancient Greece in chemical tarnish-remover bought at the local "mega-mart".

If your item uses flat pieces of glass, it'd be best to have them replaced, by an artisan, using actual iridized glass, which comes in 2mm-thick and 3mm-thick sheets; there might be 1-mm sheets?, but I'd have to check on that to be sure. If the objects to be restored have rounded glass parts, look into the possibility of having the glass parts made to order by a Glass Artist who can use Fuming to achieve a true iridized finish.

But, if this is for your own decor, and you'd be satisfied with a painted-on coating:

Look for iridescent medium/paints in good Artist's Supply shops and in Stained-Glass Supply shops, either in your area or on-line, as you prefer. The latter would probably be a better resource.

There are some articles online that describe using a applying "glaze" (thinned clearcoat), letting it become semi-dry, and then using a trowel/large palette knife to apply additional thinned topcoat in a "hatchmark" type of pattern, so that the resulting surface-structure bounces light around is a way similar to those "micro-prisms". I'm highly skeptical and would have to see it to believe it - I think the effect would be more silk-like, rather than "iridescent".

I also did see something about using lacquer. I assume that the "highly thinned lacquer" is supposed to dry with enough surface unevenness to create the iridescent effect, but *IF* it works at all, I think it'd be more by accident than by design. This *might* work with optical acrylic, but actual *natural* lacquer (i.e., the stuff made by the Laq beetle, harvested, and re-suspended in ethanol), well, I've worked with that, and I don't really believe it has much potential for iridescence, even though it *can* be smoothed to give wood a nearly-glass-like finish.

I think it would refer specifically to Nitrocellulose Lacquer, which is the glass-like finish seen on some musical instruments and antique furniture. You could try a very light "sputtering" spray of clear coating to only add a small number of tiny droplets at a time in layer after layer after layer, allowing each layer to dry in between. Note that word "nitrocellulose" - yes, it's flammable and requires care, AND a still and *very clean* environment. And that many layers takes a loooooong time. Agaiin, I remain skeptical and would have to see it to believe it.

I also saw some things on-line called "iridescent topcoat", "iridescent clear-coat", and "iridescent medium". If you're not going to have the glass parts replaced, look up those and similar terms.

Kris Krieger
- Houston, Texas, USA

adv.    koslow passivation test kit

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