This weekend I have been focusing on the superstructures. I am using the fiberglass mouldings from Fleetscale which are good but require a lot of work to use. I was a little worried about the top weight, so started to build the structure with plasticard only to find the weight was almost the same, so reverted back to the mouldings.
The general shape and scale dimensions of the mouldings are good, but the issue is that they tend to shrink and become concave or distorted in places, requiring a lot of filling and sanding back. This in turn creates another issue when sanding back it tends to expose lots of pin holes in the fiberglass.My process was to use a straight edge and mark out all the depressions, these were then filled with car body filler. Then sanded back and refilled where necessary. This is a slow and messy process, but with patience, the structure starts to become a lot more straight and true.
I then applied a filler primer which just reveals all the pin holes and other flaws in the surfaces. I then used car putty filler to fill the holes. After numerous sessions of painting/putty filler and sanding, I finally achieved the finish I required.