Blackjack

[Zephod]

Has anybody tried blackjack on their roof?

After 140F interior temperatures with the roof painted grey with rustoleum, I painted the roof with white rustoleum and have never since had interior temperatures over 104.

My dad says in Britain there's a silver paint favored for flat rooves that performs better than white paint. I looked here and found blackjack. Obviously price is a major thing for me but is this stuff good?
https://www.lowes.com/pd/BLACK-JACK-3-6-Quart-Elastomeric-Reflective-Roof-Coating-10-Year-Limited-Warranty/3013308


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[Gary Hatt - Publisher BCM]

I used Henry's Elsotomeric paint from Home Depot on my MCI bus about 5 years ago and I really liked it.  It was better than the roof paint I got from the local RV supply place and was much easier to apply. Sorry, don't know anything about Blackjack. 

https://www.walmart.com/ip/Henry-Elastomeric-Roof-Coating/111448525?wmlspartner=wlpa&selectedSellerId=1122&adid=22222222227040750026&wl0=&wl1=g&wl2=c&wl3=60925934858&wl4=pla-99899812658&wl5=9011759&wl6=&wl7=&wl8=&wl9=pla&wl10=101593696&wl11=online&wl12=111448525&wl13=&veh=sem

[Zephod]

I used Henry's Elsotomeric paint from Home Depot on my MCI bus about 5 years ago and I really liked it.  It was better than the roof paint I got from the local RV supply place and was much easier to apply. Sorry, don't know anything about Blackjack. 

https://www.walmart.com/ip/Henry-Elastomeric-Roof-Coating/111448525?wmlspartner=wlpa&selectedSellerId=1122&adid=22222222227040750026&wl0=&wl1=g&wl2=c&wl3=60925934858&wl4=pla-99899812658&wl5=9011759&wl6=&wl7=&wl8=&wl9=pla&wl10=101593696&wl11=online&wl12=111448525&wl13=&veh=sem

5 gallons seems a lot. I think I used 3/4 of a gallon using my roller when I put white rustoleum on my roof.

Did you have any problems with masking the roof for painting?


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[Dave5Cs]

http://www.hytechsales.com/

http://www.homedepot.com/p/Gardner-5-Gal-Sta-Kool-805-Metal-X-Metal-Roof-Coating-SK-8055/203856114

[brmax]

I have used the Sno Seal brand on a few vehicles, it is also a elastomer style. This worked very good on some old hunting campers. This is a white color what i used and a couple coats. A 3rd coat cut in nice around pipe vents and other roof obstacles. I think either of these mentioned as an elastomer could be the ticket. Just have to hear what all has been used today

Good day
Floyd

[Gary Hatt - Publisher BCM]

I think we used about 6 gallons and put on 3 coats.  Didn't do much masking just front and back. Went to drip rails on both sides.

[Astro]

In my previous life in the aerospace world as a paint and finish senior manager with large commercial and military aircraft, we only used two part polyurethane products on aluminum and composite aircraft skins. You have never seen expansion and contraction until you understand the temperature difference a large high altitude aircraft experiences.  Composites absorb much more heat than aluminum does and that is why you rarely see dark paints on aircraft.  While much more complex to apply, a good two part poly will be your last paint job if applied properly. My two cents....

[Iceni John]

I mixed some Thermacells insulation powder into Rustoleum gloss white enamel when I completely repainted my roof, and because it left the paint with a slightly rough suede texture I then painted two additional coats of plain Rustoleum to smooth the surface.   I don't know how much difference the magic pixie dust makes, but why not use it if there's no downsides to it?   Every little bit helps.

John

[windtrader]

why not use it if there's no downsides to it?

Is that factually documented? It seems extra particles change the binding and cohesion properties of the paint material. possibly weakening the paint bonding structure and resulting in premature paint failure.

[Zephod]

I'm wondering about all these paints. It took me maybe 45 minutes to roll m two coats of white Rustoleum. I can feel a difference. The areas at the ends still grey are almost untouchable. The white areas are just warm.

It's probably an area of diminishing returns. The temperature difference seems to be 7 degrees warmer inside than outside. How close to outside temperatures do you get without using AC?


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[Oonrahnjay]

Quoted from the other thread ...

Quote from: windtrader on August 06, 2017, 10:19:10 PM
  Being someone who has some auto body paint experience my reaction is to always do a good job in prep. Not sure how that carries across when applying elastometric material but it seems likely it will adhere best when the surface is very clean, free of all, chemicals and oils, and maybe even have some texture roughness. If that is the case, read the MSDS sheet and data sheet, you'll want to sand all surface area, remove all visible corrosion, and use a paint prep solution to remove any wax, grease, chemicals.


   I used "Bus-Kote".  http://hytechsales.com/howtopaint/painting_rv.html  They recommend a prep very much like you suggested and then a coat of their primer called "Hy-Tech #1220 Bond-It".  After the primer has dried, they suggest at least two thin coats of the elastomeric white coat.  After that, they suggest a coat of their clear sealer, "Flexi-Clear".  That's what I did and it seems to have dropped my interior temps significantly while the vehicle is in the sun.  They claim a ceramic additive to the coating provides reflective heat reduction and a further heat reduction by insulation.

[bigred]

That silver colored stuff that was mentioned before was/is probably Kool Seal .All the home improvement stores used to stock it for mobile homes .Haven't messed with mobile homes in years ,so I don't know if this stuff is still around.

[Oonrahnjay]

That silver colored stuff that was mentioned before was/is probably Kool Seal .All the home improvement stores used to stock it for mobile homes .Haven't messed with mobile homes in years ,so I don't know if this stuff is still around. [/quote

    Been a while but I had some leaks on a couple of small sheds etc. around my dad's farm years ago. I found a white paint on the ceiling was *much* cooler than either the silver-flake paint or Kool-seal.  Dunno what's the relative merits now, tho.

[windtrader]

Bruce - What change in temperature and sound have you noticed with the new coating? Just reading the guide indicates it is a quality product produced by folks who know what is necessary for a durable and long lasting coating.

[Oonrahnjay]

Bruce - What change in temperature and sound have you noticed with the new coating? Just reading the guide indicates it is a quality product produced by folks who know what is necessary for a durable and long lasting coating. 

   The first couple of days that it was out in the sun after I did the roof I didn't go upstairs -- because "you can never stand to go upstairs in the sun in a North Carolina summer".  Then one afternoon I realized that I had to go upstairs (forgot something in a drawer up there or something) and figured I'd run up and grab it and run back down.  When I got there, I was amazed -- had no comparative thermometer readings but the difference was immediately apparent.  Since then, I leave a window open downstairs and one upstairs (Peninsula windows with screens) to get the "hot air rises" thing going and don't worry about going upstairs at all.