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Old 09-07-2019, 05:25 PM   #1
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Spray vs Rolling Paint on Roof. How, why, what, where.

I plan on spraying as much of the bus myself as possible. I don't anticipate any problems with the interior, or the exterior, with one exception... the roof.

It's high. Our bus is close to our house & others. I'd have to spray down at it. I'm a big guy who's afraid of denting the roof walking on it. Blah blah blah. Long story short, I'm not nearly as confident with my ability to spray the roof as I am everything else.

I don't want to half-ass anything. Especially not the roof. So I have two questions, the second dependent on the answer to the first:

1) Would there be any measurable difference in performance, longevity, or sealing ability between rolling and spraying (assuming elastomeric paint).

2) If the answer is yes (in favor of spraying), what would suggest to help overcome some of my concerns above?

Thanks!
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Old 09-07-2019, 05:42 PM   #2
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I doubt you'll dent the roof walking on it, but then I have no idea what you weigh. I would think trying to get a thick layer spraying may develope runs you won't get rolling.
I have another question, how is everyone addressing the edge at the transfer between the elastomeric and the painted sides. I think I want to spray body color down along the edge and then tape off for roof paint. That way I don't have to fight taping a thick sharp edge to paint the sides. That or paint the sides first, which won't happen in my case.
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Old 09-07-2019, 11:59 PM   #3
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Wink

I'll answer my own question... I should have done some research before posting.
It looks like spray elastomeric paint aint happening with any equipment I have.
Back to the drawing board.
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Old 09-08-2019, 03:50 AM   #4
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Rolling worked great for us. It adds a little texture which scatters the sunlight a bit. This is a good thing for me.


As for walking on the roof ... I did it by waling as close to the rails and at the rivets where the hat channel is. If I stepped between, then the roof would detent a bit. Nothing that looked like it was lasting though.


I rolled right down to the drip rails and used a brush to cut in from the rail. I ended up developing a technique with the brush to get a similar texture to that which the roller produced.


On a test piece, I rolled some elastomeric paint and let it dry normally. I then applied primer to part . I applied implement paint (the stuff I will be using on the sides) to both primered elastommeric paint and non-primered elastomeric paint. The primer cracked. The primer and paint looked okay, but had some crazing The paint directly applied to the elastomeric paint covered wall with no effects other than the luster of the paint is not the same as primed annd sanded bare metal.
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Old 09-08-2019, 04:47 AM   #5
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Originally Posted by TheHubbardBus View Post
I plan on spraying as much of the bus myself as possible. I don't anticipate any problems with the interior, or the exterior, with one exception... the roof.

It's high. Our bus is close to our house & others. I'd have to spray down at it. I'm a big guy who's afraid of denting the roof walking on it. Blah blah blah. Long story short, I'm not nearly as confident with my ability to spray the roof as I am everything else.

I don't want to half-ass anything. Especially not the roof. So I have two questions, the second dependent on the answer to the first:

1) Would there be any measurable difference in performance, longevity, or sealing ability between rolling and spraying (assuming elastomeric paint).

2) If the answer is yes (in favor of spraying), what would suggest to help overcome some of my concerns above?

Thanks!
Question on the OP. Why do some choose to use elastomaric paint on their conversions? I was looking into epoxy based paints...(we use lot of these in the navy)

Second thought. If the orgininal paint is in good shape and so is the integrity of the sheet metal of the roof would a paint like EP be recommended?
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Old 09-08-2019, 08:25 AM   #6
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Originally Posted by DoxieLuvr2015 View Post
Question on the OP. Why do some choose to use elastomaric paint on their conversions? I was looking into epoxy based paints...(we use lot of these in the navy)

Second thought. If the orgininal paint is in good shape and so is the integrity of the sheet metal of the roof would a paint like EP be recommended?
People seem to mainly do Henry's Tropicool on the roof, and mainly because of its reflective properties - the elastomeric aspect is a side benefit that also helps seal up the roof. By most accounts, Tropicool is better than simple white paint on the roof.
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Old 09-08-2019, 10:32 AM   #7
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Originally Posted by DoxieLuvr2015 View Post
Question on the OP. Why do some choose to use elastomaric paint on their conversions? I was looking into epoxy based paints...(we use lot of these in the navy)

Second thought. If the orgininal paint is in good shape and so is the integrity of the sheet metal of the roof would a paint like EP be recommended?
Honestly, I don't want to. I'd rather spray the whole thing with automotive paint, including the roof (either epoxy or urethane). Much rather. My main concern is to prevent leaks from coming in around these 15-year-old rivets or seams, either now or in the future. I don't see any now (other than one rivet that's missing and will therefore need to be replaced), but I'm kind of wanting to future-proof things.

I plan on prepping well and resealing all seams as best I can before doing anything. I don't know if there's anything I can do around the rivets that would achieve the same results.

So yeah... if anyone can tell me how I can assure a good seal with auto paint, I'm all ears. Maybe I'm over other thinking things. Maybe it is a good seal?
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Old 09-08-2019, 10:35 AM   #8
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Rolling worked great for us. It adds a little texture which scatters the sunlight a bit. This is a good thing for me...

Thanks for all the info, Native. Much appreciated!
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Old 09-08-2019, 10:45 AM   #9
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Originally Posted by TheHubbardBus View Post
Honestly, I don't want to. I'd rather spray the whole thing with automotive paint, including the roof (either epoxy or urethane). Much rather. My main concern is to prevent leaks from coming in around these 15-year-old rivets or seams, either now or in the future. I don't see any now (other than one rivet that's missing and will therefore need to be replaced), but I'm kind of wanting to future-proof things.

I plan on prepping well and resealing all seams as best I can before doing anything. I don't know if there's anything I can do around the rivets that would achieve the same results.

So yeah... if anyone can tell me how I can assure a good seal with auto paint, I'm all ears. Maybe I'm over other thinking things. Maybe it is a good seal?
I have seen some folks here apply a body seam sealer tape over each seam on the roof before painting. That would address your leak concern and allow you to use the paint you want.

I am not a fan of tropicool. The applications that I have seen had a bit of texture and held dirt making it look a bit dingy.

Lots of folks here have used Tropicool or similar products and are happy with the outcome.
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Old 09-08-2019, 12:48 PM   #10
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Ya'll have me second guessing the Henry's now. I thought with it's self leveling feature it would lay smooth. Now everyone is saying it leaves a texture. The last thing I want on my roof is a texture for dirt to accumulate.
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