i bought this a few weeks ago. and it works awesome will fix plastic parts to stronger new. i always use the stainless steel wire mesh and melt it into the plastic and smooth it out with plastic filler.

http://www.ebay.com/itm/HL2010E-Stei...ht_2038wt_1163

i would not recommend fiber glass repairs as it almost never sticks and over time it will become undone if your not actually bonding it to fiber glass.

and heres a quick tutorial on how to repair plastic using that exact gun.

http://www.youtube.com/watch?v=4t3rOrPbQj0