Sanding and sealing the edges of the carbon fiber on modern off road RC cars is a waste of time and CA. This was done back in the day with early pan cars that hit asphalt and concrete really hard and the old cheap carbon would split. I've never seen a modern off road car chassis delaminate or even the shock towers split. The shock tower will snap clean off and no amount of CA will save that.

Don't waste your time. My .02's