Gems:
Du-Bro fueling valves (They work fine for me)
Beer cans for engine cowls (See pic attached)
K&B, Saito, and Magnum engines
Zona saws
Dremel
Real Flight G2
Twin engined planes (Haw. Had to put that in)

Junk:
Hobbico Accucycle Plus
Top Flite wooden props (Always far out of balance)
Top Flite spray paint cans.
Film coverings.

I/m sure there's more, but that's what comes to mind.

CafeenMan:

Almost total agreement on film covering. But I use a lot of it because it's faster than paint of whatever sort.

Picture attached is a hybrid - fuselage and empennage painted, wings and nacelles covered with film. And, the plane is eight years old. The film hasn't given any problem, except putting it on to start with.

Bill.