[MythosGR]

What I mentoned about the form is that in the place that sideskirts,and bumpers should be you can clearly see that it's the end of the mold...There are 2 cases:
1:You should cut them a bit more and then shape them like they should by by putty or
2:Change the way you make your molds.I'm not sure but what it's propably the problem is that you must use some kind of material(the one you use for the top of the mold) in the bottom in order not your plastic to go there...I don't know if you can understand what I describe to you...

Now for the paint I really blieve that good quality tape mask is better than liquid bt anyway is what you like more...
What you should might think is to use some decals for detailing!For things like the front-rear lights,graphics e.t.c.

Now on the crome thing I don't believe that crome paint in spray can will help a lot what I recomned is Alcad(the best chrome in spray can(the best chrome in spray can) or bare metal foil(most modelers use it)...

Hope I helped you....
Keep up the good work!