If the watch is water resistant it should also keep out the much larger particles of wood dust. Your real issue will be cleaning, Cleaning your Apple Watch - Apple Support
Depends how dirty and dusty it gets. Personally I would put safety first and I wouldn’t wear any watch or other wrist band if I was working with power tools, particularly rotating equipment with a high risk of snagging. The same goes for any other work where there is a risk of damage to a $500 watch.
so I'll have to clean it every night after work? I just pass it under the water and then dry it well?
ok, but does the dust get ruined? just wash me in the evening?
apple watch 4 and resistant to wood dust? I am a carpenter and I would not damage the device
