How to apply block colour to pdf output

The pdf output we have implemented just draws outlines for surfaces.
Is there the ability to infill a closed perimeter curve, for example display a selected colour to a panel?

Yes, there is. Simply use FillSolid in Squid’s Draw instructions. Make sure the curves are closed, planar and ideally converted to polylines with reasonable number segments.

More on exporting PDFs in this tutorial:

Great support as always.
Thank you