Well after some checking I found my 210 Chris craft transom is bad around keyhole . Have watched many videos and read so much about doing it . Just wondering if could get some advice on materials to get and anything I should do or watch for . Do I need to replace whole thing or just area that is bad ?? I haven’t done much fiberglass work but done a lot of body work and mechanic for 35 years . I’m more then eager to tackle it . Thanks for any info..