Re: Duck boat
here's how I cammo painted an aluminum canoe:
got a can of greenish paint from the mis-matched pile at the paint store--exterior latex paint
Roll it on the sides and interior
pour some dark brown paint into a roller pan
cut some leafy weeds, dip in the paint, and slap against the sides and interior, while playing appropriate tribal music.
The slap marks should be vertical on the sides and laying from side to side, not bow to stern, on the bottom and decks.