In reply to Timmd:
Polyethelene melts at low temperatures - i.e. steam iron temperature. Find a polyethelene bag - it'll have a PE recycling mark on it and probably be crlear. Often used for packing electronic items made in China.
- Cut a strip to cover your fix.
- Find some nylon off say another old waterproof and defunct brolly.
- Cut a strip of nylon the same size as your PE strip.
- Layer as follows from bottom up; Greese proof paper, repaired item, PE strip, Nylon strip, more greese proof paper.
- Set your iron to steam heat, but turn off the water or empty.
- Iron until the PE starts to melt and show at the edges of the nylon. Try to avoid ironing the fabric around - a small piece of wood under the whole thing will lift the area to be ironed nicely if you're fussy.
- Remove iron and don't move until the PE cools, or if in a hurry spray with cold water.
- Smile smugly to self at saving a few pennies.