Damaged the plastic arch liner on the car, rang up the dealer for a replacement and the price was laughable for a piece of plastic so I think it may be worth trying to mend it. Will fibre glass be flexible enough to do this job?

 

Not a chance unless you fix it in position as you need to bend it about a fair bit to remove and refit mate.

 

Any suggestions then?

Kind of came to the same conclusion to be honest but God loves a tryer.

 

That he does my friend lol.
Personally I would just get a piece of metal and drill 2 holes either side of the tear/and metal piece and then rivet it on there to hold it together mate

 

That would probably do the job nicely! Cheers mate.

 

No worries mate,or if you haven't got rivets just use some course self tapping screws

 

Try a soldering iron and a plastic coat hanger, it's how broken motorcycle fairings usually get repaired.

 

cable ties. drill several small parallel holes either side of the damage (as many as is required about 2 cm apart and just big enough to take the cable tie) and use ties to hold it together then cover with black silicone sealant.

see here for the basic idea http://www.oilyhands.co.uk/Plastic_repair.htm

this is probably best done off the car to enable access to the back to thread the ties back through. silicone to be applied once back on the car.