Ash, If you flat yer panels down with fine wet n dry you can laquer them with fancy lacquer to give a fancy arse finish.
I did a few where folk chose the ral colour for their panels which was the base colour for the chosen laquer.

Andy,
Buy yourself a gel coat spray gun and some spray gel and mess around, if you do different colours while it's still curing it kinda sorta mixes and gives a mad washed menatl finish....Roadster would look mad done like that