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Author Topic:   3M 5200 curing time in hot weather

Sfef84 posted 08-09-2011 09:48 AM ET (US)
My project 19 Raider has been out of the water for about 2 years and just got around taking out and resealing the cutwater screws with 3M 5200 (7 day cure formula, not the fast cure 24hr). Im in Galveston, TX with heat indices of 105F for over a week with nights "cooling" down to 90F.
Does the high temp extend or shorten the cure time?
Tom W Clark posted 08-09-2011 10:05 AM ET (US)
Heat should accelerate the cure, but it needs water too. Remember, polyurethane cures by moisture so mist it with a spray bottle to add some humidity in the area of the caulk and it will cure faster.
Sfef84 posted 08-09-2011 11:05 AM ET (US)
Thanks Tom,
Believe me.... Moisture is not a problem around here. The "real" temp is 95F. There is so much humidity that it increases the Heat Index to 105-110!!
Will the head and sustained 70-85% humidity take off as much as a couple days of "time to cure"?
Tom W Clark posted 08-09-2011 11:55 AM ET (US)
The time for Full Cure for a 1/8" bead at 70 degrees and 50 percent humidity is 5 days. Higher temperature and humidity should shorten this. If the bead is larger or deeper, cure time will increase.
http://multimedia.3m.com/mws/mediawebserver?66666UuZjcFSLXTtlx& EO8TVEVuQEcuZgVs6EVs6E666666--
lizard posted 08-09-2011 07:40 PM ET (US)
I had 5200 that never cured, due to the absence of moisture. I switched over to the 5200 fast cure and did not experience the same problem. I don't know what the trade off is for the fast cure (? more brittle?).
Theron1033 posted 03-06-2012 11:04 PM ET (US)
5200 as i like to call ( white devil ) should cure for at least 24hours before any kind of use, the more time you give it the better. but it will tack up to the touch in about 2 hours and cure in to no tack in about 24hours. full complete cure time is a week, unless you use the fastcure
zotcha posted 03-07-2012 10:03 AM ET (US)
Learned a neat trick from a friend in Fla.... After opening tube or cartridge reseal with cap or celophane (air tight) and store in zip-lock bag in refrigerator. Exponentially extends shelf life. zot.
kwik_wurk posted 03-07-2012 11:46 AM ET (US)
To zot's comment, I have a cheapo mini fridge full of paint rollers, calk tubes, and super glue, all enjoying second lives. (Sadly half the stuff get thrown out, but the other half gets re-used...) The real benefit comes when working on a project over weekends.
Your full cure time should be 3-4 days unless you have globs of the stuff. Being that you are sealing screws, you likely have little surface area to moisten.
I did a 5200 job in mid winter in the PNW, and it took ~10 days. (Granted it was 35-45 F out.)
Another thing I always do is make a test batch (epoxy resin/calk/5200/glue) on a piece of cardboard or wood , a little dab or smear. This way I have a reference as to how "good" my stuff is. I have even put down a sample of filler with mat over the top and drilled through it to test.

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Author	Topic: 3M 5200 curing time in hot weather
Sfef84	posted 08-09-2011 09:48 AM ET (US) My project 19 Raider has been out of the water for about 2 years and just got around taking out and resealing the cutwater screws with 3M 5200 (7 day cure formula, not the fast cure 24hr). Im in Galveston, TX with heat indices of 105F for over a week with nights "cooling" down to 90F. Does the high temp extend or shorten the cure time?
Tom W Clark	posted 08-09-2011 10:05 AM ET (US) Heat should accelerate the cure, but it needs water too. Remember, polyurethane cures by moisture so mist it with a spray bottle to add some humidity in the area of the caulk and it will cure faster.
Sfef84	posted 08-09-2011 11:05 AM ET (US) Thanks Tom, Believe me.... Moisture is not a problem around here. The "real" temp is 95F. There is so much humidity that it increases the Heat Index to 105-110!! Will the head and sustained 70-85% humidity take off as much as a couple days of "time to cure"?
Tom W Clark	posted 08-09-2011 11:55 AM ET (US) The time for Full Cure for a 1/8" bead at 70 degrees and 50 percent humidity is 5 days. Higher temperature and humidity should shorten this. If the bead is larger or deeper, cure time will increase. http://multimedia.3m.com/mws/mediawebserver?66666UuZjcFSLXTtlx& EO8TVEVuQEcuZgVs6EVs6E666666--
lizard	posted 08-09-2011 07:40 PM ET (US) I had 5200 that never cured, due to the absence of moisture. I switched over to the 5200 fast cure and did not experience the same problem. I don't know what the trade off is for the fast cure (? more brittle?).
Theron1033	posted 03-06-2012 11:04 PM ET (US) 5200 as i like to call ( white devil ) should cure for at least 24hours before any kind of use, the more time you give it the better. but it will tack up to the touch in about 2 hours and cure in to no tack in about 24hours. full complete cure time is a week, unless you use the fastcure
zotcha	posted 03-07-2012 10:03 AM ET (US) Learned a neat trick from a friend in Fla.... After opening tube or cartridge reseal with cap or celophane (air tight) and store in zip-lock bag in refrigerator. Exponentially extends shelf life. zot.
kwik_wurk	posted 03-07-2012 11:46 AM ET (US) To zot's comment, I have a cheapo mini fridge full of paint rollers, calk tubes, and super glue, all enjoying second lives. (Sadly half the stuff get thrown out, but the other half gets re-used...) The real benefit comes when working on a project over weekends. Your full cure time should be 3-4 days unless you have globs of the stuff. Being that you are sealing screws, you likely have little surface area to moisten. I did a 5200 job in mid winter in the PNW, and it took ~10 days. (Granted it was 35-45 F out.) Another thing I always do is make a test batch (epoxy resin/calk/5200/glue) on a piece of cardboard or wood , a little dab or smear. This way I have a reference as to how "good" my stuff is. I have even put down a sample of filler with mat over the top and drilled through it to test.