Posted: Jan 20, 2019 - 08:01 PM
Not sure about West Systems, but the epoxy I use from US Composites recommends minimum 80 degrees for the slow hardener, 55 degrees for medium hardener and 45 degrees for the fast hardener. I would expect West is probably similar. So probably not advised to do any epoxy work if the temp is dipping down to freezing and definitely not the slow hardener unless you want to wait until April for it to cure. If you only have a small area of delam to fix, you can use a heat lamp to warm the area up to speed up the cure. The other problem with working in the cold is that the epoxy will thicken as it cools down, so it won’t flow into the delaminated area as easily. Definitely keep the epoxy somewhere warm before doing the repair so viscosity stays low.
You also need to be careful storing resin in cold temperatures - it can crystalize at low temps.
sm