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Old 06-27-2022, 05:15 AM   #1
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Roof sealant

I'm going to replace my skylights and roof vents on my 1993 American Eagle motorhome I think it has a rubber roof. I'm looking for recommendations for sealant for under and around them.
Thanks, Dan
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Old 06-27-2022, 05:43 AM   #2
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USE BUTYL PUTTY TAPE under devices, and DICOR SELF LEVELING CAULK on roof (just not at edges). Use DICOR NO SAG on vertical joints. Good Luck.


https://www.amazon.com/s?k=butyl+put...f=nb_sb_noss_1


https://www.amazon.com/s?k=dicor+sel...f=nb_sb_noss_1
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Old 06-27-2022, 05:50 AM   #3
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p.s. If metal curbs and caulk= good, just replace LIDS= can be 10-min/each vs 60-90-min/ each. I just ordered/ received new lids and MAXXAIR covers to replace HAIL DAMAGED 3-4-yo lids, but seriously thinking about buying METAL for next time / spares? NOT real impressed with the extremely short life (=$100-$200 parts) of these plastics?
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Old 06-28-2022, 06:29 AM   #4
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I don't believe Dicor is the proper sealant for plastic skylights. SB 140 is a better choice underneath and on top of the skylight.

https://www.surebond.com/SB-140/
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Old 06-28-2022, 07:05 PM   #5
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Quote:
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I don't believe Dicor is the proper sealant for plastic skylights. SB 140 is a better choice underneath and on top of the skylight.

https://www.surebond.com/SB-140/
That is what the skylight company said I should use.
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Old 06-29-2022, 12:23 AM   #6
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Ken, both SUREBOND and DICOR are Butyl Rubber Sealants, either is fine.
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Old 06-29-2022, 06:36 AM   #7
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Dicor contains "petroleum distillates". Many of the new replacement skylights are made of Lexan polycarbonate, a material that will not tolerate petroleum distillates. SB-140 is the factory-recommended sealant "for skylights only". They use Dicor for a lot of other things, but not skylights.
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Old 07-24-2022, 05:43 AM   #8
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Quote:
Originally Posted by veraken View Post
Dicor contains "petroleum distillates". Many of the new replacement skylights are made of Lexan polycarbonate, a material that will not tolerate petroleum distillates. SB-140 is the factory-recommended sealant "for skylights only". They use Dicor for a lot of other things, but not skylights.

Benefits ans uses of (Lexan polycarbonate):


High level of impact resistance (250 times the impact resistance of glass)
Low rigidity and can be bought in flexible grades
Can handle temperatures up to 240 degrees Fahrenheit before deforming
Highly resistant to acids and other chemicals such as gasoline
Can be drilled without worry of cracking
Can be cold formed or bent without heating
Low level of flammability
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