We went for an electric heater instead. One similar to this one:



It have relatively low surface temperature, a good fan, overheating protection (cuts power), easy to inspect and can be cleaned with pressurized air. We got it just this weekend and it seems to do the trick. Was very cheap as well. Just GBP20.

We also found a cheap "industrial" vacum cleaner, so now we can clean up the mess from the sanding before we turn on the heat and work with epoxy.

I need a larger workshop though! Hope to be able to build a boathouse/workshop just by the sea in some years.