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Bert

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Reply with quote  #1 
Menards has this flat black paint.
http://www.menards.com/main/paint/exterior-paint-stain/exterior-latex-based-house-paint/rust-oleum-reg-painters-touch-flat-black-ultra-cover-paint-1-qt/p-1444452930090-c-8010.htm?tid=2997711784123435419

It isn't rated for high temp, but the PDF file says it's good to 200F.

Do you think it would work for solar air heaters safely? 
Any other suggestions on paint types.



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Bert K.
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gbwillson

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Reply with quote  #2 
Hi Bert-

That's good paint. Almost any paint will work, although I would prefer paints with low or no VOC's, just to be safe. Most indoor paints no longer have VOC's in them, but not all outdoor paints do. Outdoor paints also have UV protection built in, although under polycarbonate glazing that may not be an issue. In any case, although the paint you linked says it can be used outdoors, I didn't see anything about UV protection. In any case you will want to air out the collect for a few days. 200˚F is only likely to occur if your system were to shut down and stagnate, and then you will have other problems as well. Since you will be using a lot of black paint, you may want to consider buying in gallons, since a gallon costs about the same as two quarts. I usually paint the interior of the collector box with a brush and roller, and the screens, probes, and switches with a spray can.

Greg in MN
KevinH

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Reply with quote  #3 
I have seen mentions of people using black latex outdoor paint for the back of the box, but I don't know if it held up or not.  Gary at BuildItSolar.com is one that mentioned trying it.  Maybe someone else here has experience with it and will comment.

Flat black spray paints like Krylon or Rustoleum, including their camo versions, work well.  It can take a lot, however, when painting the back of the box in a screen collector.  There are high heat spray paints meant for a BBQ grille or auto applications that some people use, but the regular spray paints work OK.  On my first tube collector I tried the Rustoleum brush on BBQ paint, but it goes on too thick and took a long time for the odor to go away.  However for the back of the box it would be a lot cheaper than spray cans.  One person here that has spray equipment used an auto paint.
http://simplysolar.supporttopics.com/post/show_single_post?pid=1290144517&postcount=109

Kevin H
MN
Bert

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Reply with quote  #4 
I would like low VOC's if possible and will definately let it air out and cook outside a bit. Have to wait until the weather warms up a bit so hopefully there will be some other good ideas coming.
Looking forward to having a bigger collector. My first and only one is just 28 sq feet.

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Bert K.
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Garage_Hermit

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Reply with quote  #5 
It looks OK from this end.

I think the stuff to avoid is this "hi-temp" stuff - it stays soft until it has been cured, and curing means taking it to some  high temp.
I did not read the can (VERY small print...) so the stuff I bought requires 150°C minimum, before it cures -- that is 300°F...

(OK on a mobike, but pretty useless at 150°F behind my slates).
(At 11 USD, this is probably three times what it costs in the US...)
(like our gasoline...).

G_H

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Bert

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Reply with quote  #6 
Do you need to prepare the steel track before you paint it. Seems like someone mentioned oil residual.
If it needs to be cleaned then hopefully there's a less toxic way then using harsh chemicals.

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Bert K.
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KevinH

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Reply with quote  #7 
I cleaned the steel stud track with fine steel wool and some sort of general purpose cleaner (don't remember which one, just wanted to get any oil residue off).  As a final cleaning I wiped it off with rubbing alcohol.  I primed it with brush on Rustoleum Clean Metal Primer.  The small 8 oz can goes a long way.

Kevin
netttech

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Reply with quote  #8 
I've always used Flat black spray paint & prefer a standard rustoleum. It seems to cover better than some cheapos from walmart, etc.

I don't know what you are painting for the collector, bu beware of being too thick on screen. You don't want to seal the holes between the screen wire.

I found out if painting screen, cutt it to size, roll it up, spray it in the roll form. There is less paint wasted as it passes thru the screen. The pass-thru spray collects on the inner layers of screen. After one coat, unroll it, then roll it in the opposite direction to finish painting what was the inner layers.

Jeff
Central IL
Solar air & water



Bert

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Reply with quote  #9 
I was going to paint the inside of the steel track black and the outside pale yellow. Also the polyiso black.
I have some left over cinefoil. Would it be better to line the polyiso with it or paint it.
Was wondering if the screen needed painting. Thanks for he tip on that.

Could something like this be used on the track to clean or roughen it?
http://www.amazon.com/dp/B00A2MZRRM/


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Bert K.
Michigan

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solarusmc

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Reply with quote  #10 
On all 4 of my solar hot air collectors I used high temp black BBQ Spray Paint.

Covered great, dried quick and never had any odor what so ever..

only needed 1 coat.

Good luck and have fun with your project!

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Pat B. Warwick, Rhode Island Rest Assured! Comments and/or suggestions I make here at the forums on 'your' projects as well as my own have all been carefully and scientifically calculated by the 'seat of my pants'
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