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Cool Coat Rooftop coating Write-Up

pma4x4

AKA Yankeeroad
Joined
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Location
Apache Junction, Arizona
Down here in Arizona during the summer you do what you can to keep from spontaneously bursting into flames. When we buy a vehicle we ask if the A/C works before does it have tires?

I found out about this little trick a couple years ago through one of the guys on the Offroadpassport forum that has been doing this to vehicle tops for years. It's the exact stuff you paint on flat roofs on houses. I did this on my 96 cherokee two years ago and never regretted it. I will mention this as to how effective it is.

When I did my Cherokee roof I had two bolts that went thru the roof so I could mount a CB on my ceiling. During the summers these bolts would transfer the heat through to the CB bracket and you could dang near burn yourself on it. AFTER I cool coated the roof I could touch the CB bracket and mounting bolts and they were at interior temperature (cool to the touch).

Advantages:
Drops interior temp
Keeps Sun from damaging roof
Will also seal
Flexes with metal warping due to temperature changes

Ok, the project

Supplies:
1 Gallon Henrys 587 Roof top coating White ($27.97 at my locla Home depot)
(2) 1" paint brushes
(2) 3" paint brushes
2" wide painters tape
Small disposable paint tray
Try and do this in the shade when the body is not hot to the touch. This will give you more work time.

I used two of each brushes switching mid process as the paint does dry easily and starts gumming up the brush. I opted to change out to keep a nice smooth finish.

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First wash and degrease your roof. It needs to be clean like you are getting ready to do regualr paint. Tape off where you want the edge of the cool coat to end. This is strictly personal preference I chose to follow existing body lines. It also helps to keep a straight line when taping.

(Sorry the blue tape blends in with the paint).

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Now take either a green scotchbrite or some 320 automotive sandpaper and scuff up the surface. Once thats done take a damp towel and wipe off the sanding dust.

When you open the paint make sure you mix it will it may have seperated while sitting on the shelf. Once mixed it will have a consistency of Chocolate pudding.

Typically it will take 3 coats to get good coverage.

First coat

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Second coat, change direction 90 degress and go against the first coat's grain. This helps evening and sealing.

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3rd and finally coat, again change brushing 90*. I started front to back then side to side then finished front to back.

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Being that we hit 100* today already I only had to wait about 15 minutes between coats and about 2 hours for full cure.

When you go to remove the tape you almost need to pull it directly back on its self. this helps "cut" the paint and keeps a clean line.

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Finished!

Now enjoy nice cooler summer days in your vehicle. This will also help when you leave it parked in the sun all day it wont be as bad when you first get into it. You won't have to worry about redoing this for years to come.

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Nice write up and perfect timing. I need to do this on my rv trailer.

Have you noticed any sound deadening with it?

Like the pics too.
 
Everyone called me crazy for using aluminum roof coating normally used on mobile homes and metal roofs on my van and our caravan's roof after the paint blistered off and the roof got rusty...I tried using rustoleum and other polyurethane enamels,but they only lasted a couple years before they faded badly,then flaked off...not being a fan of doing things over repeatedly,I decided to try the roof coating instead..

I did the roof on my chevy van about 15 years ago.only now has the coating finally worn off and started to let surface rust show thru again...on the caravan I decided it didn't look that nice,so I painted over the coating with the polyurethane enamel using a brush...it looked pretty decent and the color even matched,but now,2 years later,its getting chalky and faded already...

I would have no problem using the aluminum roof coating again ,or the Kool-Seal stuff if I was to do them over again,rather than paint...paint just dont hold up on a hot metal roof for long,especially if you get a lot of sun and clouds,the roof constantly expands and contracts and paint fails to stay on for long...a plus is the roof coating goes on thicker and will not only hide surface rust without much preperation,it also will seal up any pinhole leaks too...and I did notice a large decrease in the temparature inside the van when the sun beat down on it...I fried in that thing when I spent a week in TN at a KOA when the roof was just painted blue...

The snow seems to melt off the roof faster in winter too,with the aluminum coating refecting the sun off it too...

I also used the same roof coating to coat all the metal track that my quonset garage bolts too that secured it to the foundation,and over the cement grout poured into the arches where they sit in that channel --its been 20 years now since I built it,and the coating has started peeling off the cement and metal in spots,but the cement itself deteriorated under it,so I dont blame the coating!...if I had not coated the metal with that stuff I'm sure it'd be rotted badly now,a few spots where it peeled off are punky now...my neighbor used it to coat a oil tank thats outside and it lasted 20 years before needing a fresh coat too...I bet it would work well as a chassis undercoating or under a carpet in the bed of a K5 or burb too,to prevent rusting..
 
Great writeup! Question though, what was the total cost of materials, specifically the topcoat stuff?
 
Sweet! I think I may do this on Tusday. But first I need to pull my roof rack off and do a little rust repair.
 
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