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Author Topic:   5200 NON-fast cure, in the desert

pcrussell50 posted 06-22-2010 04:08 PM ET (US)
48 hours ago, I sealed some non-structural cracks in my (non-Whaler), fast lake boat. We keep it at the wifes grandparents house along the Colorado River, near Needles, CA. This is hot, dry, (really dry), desert with daytime highs in the 105-115 degF range.
Anyway, as the title suggests, I used 3M 5200 of the "regular" variety, as opposed to the "fast cure". The packaging said to expect it to become "tacky" in 48 hours at 70 degF. Well, it's been 48 hours and the lowest temperature it's seen has been around 80, with daytime highs in the low 100's. Yet when I just picked up the nail I used to puncture the tube, it came off easily on my fingers. I was sure that, if anything, the heat would speed up the curing time. What gives?
-Peter
RMS posted 06-22-2010 04:11 PM ET (US)
I've been told that moisture cures 5200, which is why it cures quicker below the waterline if you launch the vessel soon after application. Try putting the nail in a glass of water for a day or so. Bob
Tom W Clark posted 06-22-2010 04:22 PM ET (US)
Yup, polyurethanes cure by moisture (usually found in the air).
Try spritzing it with a spray bottle of water now and then. It will take a while to cure, perhaps a week.
lizard posted 06-23-2010 10:45 PM ET (US)
Twice I have experience 3M 5200 NEVER curing. I followed the directions and never figured out what happened. I changed to 5200 Fast Cure and had no problems.
Tom W Clark posted 06-24-2010 09:58 AM ET (US)
No humidity, no cure.
Russ 13 posted 06-24-2010 12:50 PM ET (US)
I too had the same problems in Colorado...
Being from Florida Lot's of humidity...no cure problem.
I second the spritz of water to the application..
No moisture...no cure.

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Author	Topic: 5200 NON-fast cure, in the desert
pcrussell50	posted 06-22-2010 04:08 PM ET (US) 48 hours ago, I sealed some non-structural cracks in my (non-Whaler), fast lake boat. We keep it at the wifes grandparents house along the Colorado River, near Needles, CA. This is hot, dry, (really dry), desert with daytime highs in the 105-115 degF range. Anyway, as the title suggests, I used 3M 5200 of the "regular" variety, as opposed to the "fast cure". The packaging said to expect it to become "tacky" in 48 hours at 70 degF. Well, it's been 48 hours and the lowest temperature it's seen has been around 80, with daytime highs in the low 100's. Yet when I just picked up the nail I used to puncture the tube, it came off easily on my fingers. I was sure that, if anything, the heat would speed up the curing time. What gives? -Peter
RMS	posted 06-22-2010 04:11 PM ET (US) I've been told that moisture cures 5200, which is why it cures quicker below the waterline if you launch the vessel soon after application. Try putting the nail in a glass of water for a day or so. Bob
Tom W Clark	posted 06-22-2010 04:22 PM ET (US) Yup, polyurethanes cure by moisture (usually found in the air). Try spritzing it with a spray bottle of water now and then. It will take a while to cure, perhaps a week.
lizard	posted 06-23-2010 10:45 PM ET (US) Twice I have experience 3M 5200 NEVER curing. I followed the directions and never figured out what happened. I changed to 5200 Fast Cure and had no problems.
Tom W Clark	posted 06-24-2010 09:58 AM ET (US) No humidity, no cure.
Russ 13	posted 06-24-2010 12:50 PM ET (US) I too had the same problems in Colorado... Being from Florida Lot's of humidity...no cure problem. I second the spritz of water to the application.. No moisture...no cure.