As i remember first you have to hold/clamp the piece in the required position so it hasn,t spread
abrade the the rear and apply a patch to the abraded area several inches either side is best
then when that has cured you can grind out all the damaged area ensure the rest is masked you dont want any marks or dings
then you build up the ground out area to just below the finished surface this can be done with resin/repair tissue/or microfibers/or that funny talc like stuff etc
then you can apply gelcoat to finish the build up ( i think sometimes a wax is added to make it easier to polish out )
then you sand
then wetndry
then wetndry
then wetndry
then refill the pinholes with more gelcoat
then you sand
then you wetndry
then you wetndry x1000000000000 times
then you polish
and hey presto its as good as new and the repair can be invisible
hey its not that bad really but you get the idea
its just quite a bit of work and elbow grease and well within the abilities of a competant diyer
me i,d buy saturn sc a tub of premixed gelcoat and have a bloody good haggle ( andy shortie deserves a payback .. lol
) and let them keep the gel they are sure to get an order in that colour soon ...
you would be doing them a favour.......
cheers les g