Here's something from the Kyosho site I haven't seen before.
. . . could be worthwhile for some of us hackers.
FRP Gel Sheet (1.0mm) No.96160
Reinforce and repair the polycarbonate bodies.
It is very easy and simple how to use!
Cut the FRP Gel Sheet for proper size, then apply this sheet to back side of the polycarbonate body. After that expose the body to sunlight for 5 to 30 minitues until the sheet becomes hard.
*Includes 1 piece. for various models.
*Dimensions : 100x200mm (Thickness : 1.0mm)