Originally Posted by Chrisc
Why is it, that on a cold day of around 60 degrees F, you go inside (or in my case down below when the wife's away) put on the heater and warm up the cabin to 75 degrees F, bring inside your unmixed resin to acclimatise for an hour or so, then mix up your epoxy and do your little job in a nice warm cabin, but it take hours and hours to cure?
Chris you just explained it yourself. The air temp inside the boat
is now at a comfy 75 degrees. The epoxy would also be at 75 or so you would think. The problem is that the surface you are applying the epoxy to is not at 75 degrees, its considerably colder and what ever heat the heater is putting to it via air transferr is being bled away super fast. Unless you keep that heater on for a day or so, the surface will always be lower.
Several years ago I got involved in a project
to build an Electric
car for racing
. One of the things we did was remove the sun roof and rear window and replace them with foam in the sunroof opening and a light wood frame and lexan
in the rear window. We did this in a high school
auto shop, and they had the thermostat locked down. It was so cold in there that at times you could see your breath. I needed to do the epoxy work
on site, and at first it was a nightmare. The car body never ever got warm even with heaters blowing warm air at it from a foot away. It was just too big. Plus the epoxy resin was just too cold.
this by stealing the large coffee urn from the staff room, and keeping the resin can in there with it turned on to warm. Ditto with the hardener. We heated up the body in the area we needed to do the work
by direct radiation using an infrared heater focused on the work area. This actually raised the body temp up to a nice workable level. We then did the epoxy work and when complete the infrared heater was focused on the inside of the car body and a tent was built around the work area, enclosing as small a volume as possible. In this we placed a regular hot air heater to keep the outside air warm. That solved
In your case I would suggest application of heat to the work area, as well as heating
. That way the resin will kick quite happily.
66 days n a wake up