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Old 06-26-2015, 10:43 AM   #11
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Jazty, I remember reading that thread but couldn't find it earlier. Thanks! I had forgotten about the sawdust experiment. Someone on there mentioned glass bubble additives on there too, and I think that sounds like a grand idea. I think a few coats of white paint with the glass bubbles mixed in should do the trick, and cheaper than elastomeric! Our roof has no leaks, so that will be the winner.
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Old 06-26-2015, 11:31 AM   #12
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Jazty, I remember reading that thread but couldn't find it earlier. Thanks! I had forgotten about the sawdust experiment. Someone on there mentioned glass bubble additives on there too, and I think that sounds like a grand idea. I think a few coats of white paint with the glass bubbles mixed in should do the trick, and cheaper than elastomeric! Our roof has no leaks, so that will be the winner.
I think you'll have a tough time making it cheaper by using glass bubbles. A previous member was considering something similar, but after the glass bubble purchase price + shipping it worked out to about the same price as buying additional white roofing paint, which provides a nicer product and equal benefit.

How much are you getting the white paint for? The elastomeric stuff is $15 a gallon and made for roofs. I wouldn't dream of using typical latex house paint. It won't last. So the other accessible option is to use Rustoleum at $20-$25 a gallon.

The elastomeric paint really isn't that expensive and it works great at reflecting the sun.. Seriously, the stuff can near blind you if you look at it on a sunny day. Glass or ceramic bubbles make for an ugly finish and provide only the same benefits as a couple extra coats of nice paint.

I understand that people want to believe in this stuff, but you just can't effectively insulate paint. The FTC has tested and decided this, as well as third-party tests. You can control its thickness, colour and choose a thick, rubber type product to reflect the sun away, but it's not insulation by any real measure. You're 95% feeling the effects of reflected sunlight.

I also understand that people want to take a quick and cheap route that provides good results.. and I'm telling you from a good deal of experimentation and success that this IS the quick and cheap route that provides good results. It doesn't get much easier. Buy paint. Clean. Spread paint.

But in the end, it doesn't matter.. It's your money... It's your bus...
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Old 06-26-2015, 12:09 PM   #13
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I think the price difference comes in the coverage area.
According to the coverage guide on the back of the 5-gallon elastomeric, it would take one bucket per coat.
At $27 a gallon, the Rustoleum would cover three coats with two gallons.
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Old 06-26-2015, 12:18 PM   #14
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Poll: elastomeric vs. white paint on roof

I think whatever you find best is what's best for you~
I love the whole Goat and Dogs thing... Hahaha...
I wish I could just take off - one day... One Day
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Old 06-26-2015, 12:36 PM   #15
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I think the price difference comes in the coverage area.
According to the coverage guide on the back of the 5-gallon elastomeric, it would take one bucket per coat.
At $27 a gallon, the Rustoleum would cover three coats with two gallons.
That's an arbitrary measurement, though. The real question is how thick the product is after one coat. There's no standard that I know of for recommending the number of coats or paint thickness. It just depends on what the manufacturer is advising based on what the paint is supposed to accomplish. Rustoleum is designed to colour and protect metal. White roofing paint is designed to reflect sun.

One coat of elastomeric paint could be three times as thick as one coat of rustoleum. I don't actually know, though. I haven't done a comparison of that particular trait side-by-side, but I've used both paints individually. To paint my solar panel mounts I brushed on 5 coats of white Tremclad (Canadian name for Rustoleum). On my roof I rolled 5 coats of Henry's Solarflex. Not a direct comparison, obviously, but the Solarflex is easily twice as thick as the Rustoleum.
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Old 06-26-2015, 12:46 PM   #16
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Why is the aluminum roof paint so much cheaper? Does it make much difference? Other than blinding people as I go down the road...
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Old 06-26-2015, 12:51 PM   #17
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Like this?

4.75 Gal. 555 Premium Aluminum Roof Coating

Can't say I've ever used it.. Home depot's website has it for $80 for a 4.75 US gallon pail.
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Old 06-26-2015, 02:07 PM   #18
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Interesting and timely thread as I'm about to move on to working on the roof.

Is there an added benefit to spending the money and going with a 100% Silicone roof covering like Henry's Tropi Cool versus a standard elastomeric coating? I noticed the Tropi cool comes with a lifetime warranty versus a 10yr for the elastomeric stuff, but there is quite a bit of difference in price.

Silicone Roof Coating - Henry Company
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Old 06-26-2015, 02:20 PM   #19
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Interesting and timely thread as I'm about to move on to working on the roof.

Is there an added benefit to spending the money and going with a 100% Silicone roof covering like Henry's Tropi Cool versus a standard elastomeric coating? I noticed the Tropi cool comes with a lifetime warranty versus a 10yr for the elastomeric stuff, but there is quite a bit of difference in price.

Silicone Roof Coating - Henry Company
I wouldn't expect there to be any difference in performance, but it's likely a more resilient product. That would make sense considering they offer a lifetime warranty on it.
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Old 06-26-2015, 10:41 PM   #20
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I bought a 5 gallon bucket of HyTech powder when we first got the bus. I've used it on the walls and the floor with whatever paint I used. I don't remember exactly how much I used so far, but I do know I have enough still for two to three gallons of paint to paint the roof.

The roof was painted white when we bought the bus. It's very smooth so I don't know what was used. It actually doesn't need to be painted, we're just going to do a couple coats of Rustoleum white with Hytech powder when we get up there to take off the roof rack and patch up the holes from the rack. Don't get me going on the subject of removing the rack (I want to keep it).

So far, the bus sits all day until around 4 in the direct sun and the temperature inside has only gotten to be around 5 degrees hotter than it is outside.

The walls are not even warm nor is the floor during that time, so a couple of coats of HyTech on the roof should really help with cooling.

In other words, I agree wholeheartedly with Tangos opinion.

I guess, bottom line in response to your question, buy & use whatever suits your fancy. I bet you were already leaning towards a certain product when you first posted you question and most likely just wanted someone else's approval. Which, if so, you may or may not have gotten.
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