Hi Mike,
Yes, I agree with Dave.
Kits in Hold Luggage not a good idea unless your thinking of re-kitting them anyway!
I would have them in you hand luggage.
Other tools, paint, knives, glues etc should travel okay in Hold Luggage, but obviously not aerosols. But to be safe why not ask your flight provider or airport for advice on what can and cannot be put into the Hold or Hand Luggage. If you explain exactly what you intend to take I'm sure they will guide you.
Bigkev