The difference between standard machine grey and just bright white spray paint 
from the hardware store is dramatic.  I suspect everything beyond that is 


Also back around 2005 when I ordered my first outdoor cabinet from DDB, I 
thought I wanted unpainted metal aluminum since all the traffic control boxes I 
see are plain metal or stainless steel.  The salesperson said I absolutely 
didn’t want plain metal because it would get hot in the sun and what I wanted 
was the cream color.


From: AF <> On Behalf Of Bill Prince
Sent: Thursday, August 15, 2019 6:19 PM
Subject: Re: [AFMUG] Solar load


If you look up insulating paint on Wikipedia, the entry there says all ceramic 
heat-reflective coatings are snake oil.

I did find a good discussion on Scientific American 
They don't exactly describe it as snake oil, but they also suggest that you not 
get your hopes up.

I suspect you can get your best results with a coat of reflective white paint, 
and try to keep it clean.



On 8/15/2019 1:12 PM, <>  wrote:

Be interesting to do a bake off between this and the plain “satellite white” I 



I have always found it interesting that highly reflective things like polished 
aluminum, chrome and silver paint seem to be really bad at reflecting heat/sun. 
 But we have all grabbed a chrome wrench that has been left in the hot summer 
sun and realized hot much it absorbs.  I am guessing what we see as reflective, 
Infra Red sees as flat black.  


From: Bill Prince 

Sent: Thursday, August 15, 2019 1:46 PM

To: <>  

Subject: Re: [AFMUG] Solar load


Which reminds me of this material that a friend clued me in on. 

You can get this at Home Depot (for example). It is pricey; around $250 per 5 
gallon bucket, AND it needs a top coat of another material at near the same 
price. However, for an advertised reduction in temperature of over 60 degrees 
F, it may be worth a look.


On 8/15/2019 12:35 PM, Lewis Bergman wrote:

I remember Chuck doing a study on this same subject so I thought there might be 
some interest.

Cabinet heat load 



Lewis Bergman 

325-439-0533 Cell


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