So you run around looking for something to secure the plastic. Bungie cords? Where are you going to hook them up? Tape? You'll end up wrapped in tape watching the plastic blowing toward the neighbor's yard.
Grab a couple of pieces of chain. I'm sure you have some pieces of chain that are 4' to 6' in length. If not, invest in some and you will wonder how you ever lived without them. Lay the chain over the plastic and call it done. If you have a long piece, don't wrap the chain around the item being protected. Instead, drape the chain in a series of "S" curves.
Here is the motor of the #3 Cub covered with a plastic bag and weighted with chains.
Will this latchup hold through a hurricane? No, but not much does, and this is only a temporary thing. As soon as the weather moderates, you can either finish what you started or come up with more reliable protection.
Rick (new uses for old things) Dulas
it's only 77 now, this winter is killing me 
