well its improtant to me i was wodnering wehta do u guys use to like amke side skirts and stuff

do u use bondo body filler
tamiya epoxy etc.....?

This question has been answered many times if you search for it. Use epoxy putty, it holds its form like pottery clay but hardens to a very strong piece of material. Look for it at modelling shops.

For make body parts I use car filler what you can find in every car needs shops, second thing what I use is Epo glue, it's good to make parts strong.