Hard to say as it depends on the nature of the work/repair, humidity/damp, and the amount of time it has >5 degrees (or inversely how long it has to 'wait' before it warms up again). As a recent 'sample', I did 7 small glass and epoxy patch jobs last week on a day forecast as 10-12 degrees (but dropping right down overnight). 6 of 7 worked perfectly - but one decided it wasn't having it and I found the laminate (cured!) in the bottom of the bilge having dropped off the repair. Factors other than temps could have caused this - but all 7 areas were prepped/applied the same (and I've done this hundreds of times in the past few years). The failed repair was the last one I laminated later in the afternoon and I suspect as it got cold/damp overnight, the weight of the wetted glass took over and it fell off its otherwise prepped/primed area and into the bilge (where, as I said, I did cure perfectly!).
