Most exterior paints will cover about 400 square feet per gallon for one coat. But adjust for waste factors like the type of surface and equipment used. If the surface is rough or porous, add 20% to the total gallons figured. If siding is narrow (4 to 5 in.), add 10%. If on a corrugated surface, add 33%. Also add on a 10% waste factor if using brushes or rollers, add 20% for airless paint sprayers, and add about 40% for air paint sprayers.
When you hook up a power tool to an heavy-duty extension cord, remember that all cords are not alike and all power tools do not necessarily require the same size cord. Check each tool’s owners manual to find out its requirements. Here’s a helpful guide for cords less than 50 ft.
#12 gauge – 1920 watts – 16 amps – large bench saws
#14 gauge – 1440 watts – 12 amps – portable power saws, routers
#16 gauge – 840 watts – 7 amps – belt sanders, recip saws
#18 gauge – 600 watts – 5 amps – drills, small sanders