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New super white paint that cools.
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1988M5
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PostPosted: Tue Sep 21, 2021 11:54 am    Post subject: New super white paint that cools. Reply with quote

https://www.purdue.edu/newsroom/releases/2021/Q2/t...ally..html

How the whitest paint is also the coolest

The paint’s whiteness also means that the paint is the coolest on record. Using high-accuracy temperature reading equipment called thermocouples, the researchers demonstrated outdoors that the paint can keep surfaces 19 degrees Fahrenheit cooler than their ambient surroundings at night. It can also cool surfaces 8 degrees Fahrenheit below their surroundings under strong sunlight during noon hours.
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Steve M.
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PostPosted: Tue Sep 21, 2021 12:25 pm    Post subject: Re: New super white paint that cools. Reply with quote

...
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bobbyblack Premium Member
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PostPosted: Tue Sep 21, 2021 12:49 pm    Post subject: Re: New super white paint that cools. Reply with quote

I found a supplier in July. I was quoted just over $650 for the necessary primer (off white) and the topcoat, for my two Westy tops..plus shipping.
Its a story from April..
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djkeev
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PostPosted: Tue Sep 21, 2021 1:17 pm    Post subject: Re: New super white paint that cools. Reply with quote

How is this news?

Any child knows that if you put your hand on a white item in the Summer Sun and the same item painted black sitting in the Summer Sun, the black item will burn your hand!

Or maybe kids spend so much time today sitting at a keyboard in the Air Conditioned house that they really haven't any concept of the power of the Sun.........

If you are barefoot crossing an asphalt road, you pause on the center white line to cool off your feet half way across.

Dave
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jlrftype7
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PostPosted: Tue Sep 21, 2021 1:21 pm    Post subject: Re: New super white paint that cools. Reply with quote

djkeev wrote:
How is this news?

Any child knows that if you put your hand on a white item in the Summer Sun and the same item painted black sitting in the Summer Sun, the black item will burn your hand!

Or maybe kids spend so much time today sitting at a keyboard in the Air Conditioned house that they really haven't any concept of the power of the Sun.........

If you are barefoot crossing an asphalt road, you pause on the center white line to cool off your feet half way across.

Dave
Apparently it's the degree to which this new white paint has reached over current White Coatings. Way over and above them in terms of reflective and cooling.
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djkeev
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PostPosted: Tue Sep 21, 2021 1:31 pm    Post subject: Re: New super white paint that cools. Reply with quote

Auto trader did an informal test with a black car and a white car in the sun.

There was a 17° difference!

This miracle paint has a 19° difference ...... Meh!

https://www.usedvwaudi.com/blog/2019/01/07/are-black-cars-really-hotter-than-white-cars

Dave
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ProspectiveOwnergon
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PostPosted: Tue Sep 21, 2021 1:34 pm    Post subject: Re: New super white paint that cools. Reply with quote

Also provides guaranteed blindness due to insane light reflection. :p
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?Waldo?
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PostPosted: Tue Sep 21, 2021 1:38 pm    Post subject: Re: New super white paint that cools. Reply with quote

djkeev wrote:
Auto trader did an informal test with a black car and a white car in the sun.

There was a 17° difference!

This miracle paint has a 19° difference ...... Meh!

https://www.usedvwaudi.com/blog/2019/01/07/are-black-cars-really-hotter-than-white-cars

Dave


The quoted 19° difference and the linked 17° difference are not even an apples to oranges comparison but rather an apples to dragonfly wingbeats comparison.
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djkeev
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PostPosted: Tue Sep 21, 2021 1:56 pm    Post subject: Re: New super white paint that cools. Reply with quote

You are correct.....

In general white roofs are 40 - 80° Cooler than a black roof on a Sunny day.

The number depends upon what web site you read.
The EPA says 60° cooler.

Who knows? I've never done testing.

Bottom line?
I'm not stepping up to the sales counter to pay premium prices for white paint. If this is even the case. I don't know what this high tech paint costs.
You go right ahead.

It just seems like someone is creating a market for some fancy unneeded product.

Dave
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bobbyblack Premium Member
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PostPosted: Tue Sep 21, 2021 2:05 pm    Post subject: Re: New super white paint that cools. Reply with quote

I'm still going to do it with this new paint. I have an unusual scenario where I can paint one top, measure in a side by side comparison, then decide weather the cost was worth it. I will be doing a thread on the costs, where I sourced the materials, etc. It was a near miss this year, just had not felt right with the half-on half-off sales team I was in contact with. One said that another member was preparing an invoice, and the other didn't know about that, I guess. So Summer is over. Next Spring it will happen, and perhaps the price will be down a bit. $650 for paint seems high for two Westy tops, except when you find out how much the paint on the bus actually costs... Plenty of folks pay many thousands to get their bus painted.. Things just cost money, that's about it.
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djkeev
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PostPosted: Tue Sep 21, 2021 2:13 pm    Post subject: Re: New super white paint that cools. Reply with quote

Looking forward to the report Bobby!

And when I pass through Iowa with my Rustoleum farm implement white roof, we can park side by side and see how much less cool my $20 white roof is.

Dave
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skills@eurocarsplus
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PostPosted: Tue Sep 21, 2021 2:15 pm    Post subject: Re: New super white paint that cools. Reply with quote

Steve M. wrote:
How much to buy it Ka Ching Ka Ching


and you put me on your ignore list because "you know my type" or some such thing.

unreal.

I saw almost an identical article on an automotive paint site. i'm not sure if they worked out the ideal prep for all substrates just yet. I'd hold off until all of that was settled and if they find soap/cleaning products do anything weird to it.

it's been mu experience that any "high performance" coating has it's own rap sheet in terms of application and care.

it would be one hell of a bad day to find out it peeled up after a short time, or worse yet had some crazy reaction with your substrate
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DanHoug
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PostPosted: Tue Sep 21, 2021 3:02 pm    Post subject: Re: New super white paint that cools. Reply with quote

Folks--- this paint is more than white paint. it actually has more emissivity than absorptance. this means it actually COOLS the surface below ambient, which is truly innovative. read the science:
https://pubs.acs.org/doi/10.1021/acsami.1c02368

that doesn't mean it is ready for prime time on the top of a van. issues with adhesion and degradation are not yet worked out so i would hold off but the science is there... it COOLS a surface it is on. in the lab. it is something to watch but let them work it into a stable production product.

i would also imagine the heat conduction of the surface it is painted on is crucial to seeing any benefit other than rilly rilly white paint. and fiberglass is a terrible heat conductor.
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campism
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PostPosted: Tue Sep 21, 2021 3:35 pm    Post subject: Re: New super white paint that cools. Reply with quote

Not a paint but something similar. Several years ago we removed the silver coating from the metal roof of our old house and applied the Hydro Stop product. We took the manufacturer's course of instruction so we could be authorized do the work and have the warranty apply. It's cool roof technology, a coating that is thicker than paint usually is, but it sure worked. Metal roof in Virginia in August? Hot, hot, hot whether with the old coating or in bare metal halfway through the job. With the white coating on it we could walk barefoot. I'd guess waaay more than a delta of 19 degrees.

Happened to use some of the leftovers recently to help sealcoat the roof of our big Dodgect. The procedure involves embedding their non-woven fabric in the first of the two coats.
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PostPosted: Tue Sep 21, 2021 3:56 pm    Post subject: Re: New super white paint that cools. Reply with quote

Any child knows center line is yellow.
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djkeev
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PostPosted: Tue Sep 21, 2021 4:04 pm    Post subject: Re: New super white paint that cools. Reply with quote

GreggK wrote:
Any child knows center line is yellow.


Yellow road lines are a darn newfangled invention!

Yellow became Nationwide beginning in 1971.

Who remembers black lines in Florida?

Dave
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Last edited by djkeev on Tue Sep 21, 2021 4:09 pm; edited 1 time in total
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PostPosted: Tue Sep 21, 2021 4:06 pm    Post subject: Re: New super white paint that cools. Reply with quote

HA HA HA!
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1988M5
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PostPosted: Tue Sep 21, 2021 6:06 pm    Post subject: Re: New super white paint that cools. Reply with quote

Member 'DanHoug' had it right when he wrote, "this means it actually COOLS the surface below ambient". I knew some old timers would brush this off as "DUH, a white surface is way cooler than a dark one", but this is different. It's a new technology that acts as a cooling devise, just as an AC system does. Member 'BobbyBlack' is privy and will take the plunge for us, not too much coin for a potential game changer. Wonder if it works as advertised, could we paint the insides of curtains/shades with the coating? That would be cool.

BK
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PostPosted: Tue Sep 21, 2021 6:18 pm    Post subject: Re: New super white paint that cools. Reply with quote

Emissivity and absorbance are radiative means of heat transfer. This paint resists radiative heat transfer but not convective.

So since humid air is more convective, this paint will work best where/when humidity is low.

-Rob
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PostPosted: Tue Sep 21, 2021 6:47 pm    Post subject: Re: New super white paint that cools. Reply with quote

Robw_z wrote:
this paint will work best where/when humidity is low.

-Rob



YAY for the SW!
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