Guy's had a search of the forum's but couldnt find exaclty what I was looking for, has anyone got a link to a good tuturial on how to fibreglass a firewall on a arf. I'm in the process of building a H9 spitfire and from what I've been reading the firewall need's to be reinforced. I never worked with fibreglass before so Im asking for assitance in this area, thank's.