Question: Can I finish my firewall to enhance it's appearance and seal it against oil and fuel?

Answer: Yes.

Better Answer: The firewalls are made from either 6mm plywood or multiple layers of thinner 2-3mm plywood laminated together. They are more than strong enough for any modelling application. They will withstand oil and fuel without further treatment or finishing. If you wish to seal the edges and faces that is also fine. When finishing, we suggest checking the edges for any voids, fill them with CA or Epoxy and then seal the edges and faces with finishing resin or epoxy. Let dry and then install your engine mounts and tank.