Plastic Restoration

I told you about my $2 GPS. In the process of trying to buff out the fogging on the plastic lens that covers the LCD, I gouged it a couple of times. (shame on me for using power tools) I thought about replacing it somehow but the Magellan 315 is a sealed unit. I can live with it if I have to - they're not that bad, but does anyone know of any products to fill and fix gouges in clear plastic?