Plastic sheeting is a useful tool to have around for construction jobs, painting projects, protecting outdoor items, or any number of other useful purposes. Unfortunately, plastic sheets can be fairly flimsy, and will rip or tear easily. If your plastic sheet has got a tear, consider repairing it with clear packing tape before throwing it away. You can continue to use a repaired plastic sheet for any purposes that don't require a completely waterproof enclosure.
Clean the area of the plastic sheet which is torn or broken. Use soap, water and a clean rag to get any dirt or mud off the sheet. Dry the sheet completely when done.
Examine the area that you need to fix. Plastic sheets are prone to rips and tears, so look closely at the rest of the area to make sure you've found all the rips.
Cut off a piece of clear packing tape that is slightly longer than the rip. Draw the two sides of the rip together, and place the piece of tape over the rip. Smooth the tape down to get rid of any air bubbles.
Flip the plastic sheet over and find the tear on the other side. Cut another piece of tape of the same length,and reinforce the initial piece of tape by placing it over the tear on the opposite side.
Smooth down both pieces of tape to remove air bubbles.