Csail
N/A
Swmbo reckons it is too cold to apply resin in a locker to hold a mounting on. It is about 8 degrees here. Is she right?
GRP
- Thread starter Csail
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oldsaltoz
Well-Known Member
20*c is good, 16*c is marginal.
You can put a heater on it though, but leave it running overnight.
Avagoodweekend......
You can put a heater on it though, but leave it running overnight.
Avagoodweekend......
Csail
N/A
Hey G'day, so she is right! You must know my uncle, he is just across your island in Perth?
oldsaltoz
Well-Known Member
I lived in Perth for a few years and moved North to Damper and the Iron Ore export industry, great sailing with an offshore breeze and fantastic coral reefs to dive and fish. Both my sons leaned the art of sailing there and still sail to this day.
Avagoodweekend......
Avagoodweekend......
Csail
N/A
I was only joking, but on the off chance he is Tommy Higson.
Csail
N/A
Are there any other systems that will cure at lower temps?
boatmike
Well-Known Member
Not really.
You ideally need low humidity and 16 degrees. Some epoxys cure at lower temp but you won't like using them as they are very difficult to "wet out"
You ideally need low humidity and 16 degrees. Some epoxys cure at lower temp but you won't like using them as they are very difficult to "wet out"
wotayottie
Well-Known Member
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Are there any other systems that will cure at lower temps?
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Epoxy will . Have used West with snow on the ground outside - admittedly with a small heater but still not warm.
Are there any other systems that will cure at lower temps?
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Epoxy will . Have used West with snow on the ground outside - admittedly with a small heater but still not warm.
bigwow
Well-Known Member
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Are there any other systems that will cure at lower temps?
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Sikaflex
Are there any other systems that will cure at lower temps?
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Sikaflex
DrBob
Well-Known Member
It's not just the temperature you apply the resin at but the temperature it sees in the next 24 hours. The gel time is affected by temperature hence is much slower below 15 C but the critical thing is that 90% of the strength is built up between 1 hour and 48 hrs after gelling. If the temperature drops overnight then this will mean less cross linking and lower physical props. I spent my first 6 years in industry cutting my teeth on polyester resin chemistry and curing!
You can formulate epoxies to cure at sub 15 C but they dont develop the strength of "normal" cured epoxies - but are probably better than polyester. They are very viscous and dont wet very well.
I would worry about most adhesives at temps of less than 10 C for 24 hours. We managed to develop a underwater impression material for north sea weld analysis which cured in 30 secs at 4 deg C but that is very unusual. Most of the chemisty used in sealants, adhesives, paints etc does not like cold temperatures.
You can formulate epoxies to cure at sub 15 C but they dont develop the strength of "normal" cured epoxies - but are probably better than polyester. They are very viscous and dont wet very well.
I would worry about most adhesives at temps of less than 10 C for 24 hours. We managed to develop a underwater impression material for north sea weld analysis which cured in 30 secs at 4 deg C but that is very unusual. Most of the chemisty used in sealants, adhesives, paints etc does not like cold temperatures.
ningcompoop
Well-Known Member
Strathglass
Well-Known Member
If you can heat the surrounding area enough to the correct temperature and keep it at that for about a day then it will set ok. It is fairly essential to be able to do this in Scotland in the winter.
I have been using epoxy off and on inside the boat for the last few weeks. Some days the cover over the boat has had 3" of snow or frozen water on it.
Yesterday afternoon I epoxied two iroko pads to the deck for the clutches and this morning it has set very well. The outside temperature dropped to 2 deg C but between the boat cover and a heater I kept the deck temperature at 20 deg overnight.
It would be more difficult to epoxy anything to the inside of the hull as it would be hard to raise the temperature up enough.
I must also say that I have just had to replace two fan heaters as the fan motors had burnt out.
As has been said epoxies are available for a wide range of temperatures but not off the shelf from retailers.
It is currently West products I am using but I am not biased towards any one brand.
Iain
I have been using epoxy off and on inside the boat for the last few weeks. Some days the cover over the boat has had 3" of snow or frozen water on it.
Yesterday afternoon I epoxied two iroko pads to the deck for the clutches and this morning it has set very well. The outside temperature dropped to 2 deg C but between the boat cover and a heater I kept the deck temperature at 20 deg overnight.
It would be more difficult to epoxy anything to the inside of the hull as it would be hard to raise the temperature up enough.
I must also say that I have just had to replace two fan heaters as the fan motors had burnt out.
As has been said epoxies are available for a wide range of temperatures but not off the shelf from retailers.
It is currently West products I am using but I am not biased towards any one brand.
Iain