RC vehicles go through a lot of roughhousing in their day-to-day life, so reinforcing the polycarbonate shell is always a good idea. To strengthen areas of your RC shell, you will need some basic mesh, found in most hardware stores, and some Deluxe Materials Body Armour, found here
To reinforce, target the key area/s of vulnerability in the shell, such as the front or back of the vehicle. Place a small amount of mesh onto the inside area of the shell. Then, it’s as easy as applying some Body Armour to the mesh and spreading it around the area. Be sure to wear gloves when handling Body Armour.
Here’s a video with step-by-step instructions on strengthening your RC shell: