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Hi All
I have a repair procedure that might be of interest.
I have succesfully repaired many a vw dash.
I remove the old and scrub it with the strongest detergent I can find (fully dismantle the thing) I then take a sanding block and remove as many of the edges of the cracks so as to make everything on one plane. I then use plasticene to fill all the canyons left. I smooth this to the level of the surrounding dash. I then laminate two to three layers of fibreglass over the whole dash ( bear in mind that the glass ads thickness to the dash so open all areas where there is close fitting parts. sand the glass smooth and finish with a layer of boddy filler. Remember that this is the make or break layer and will determine the final surface. When smooth cover with a thin layer of primer and finally spray with a stonechip coating as applied to most new cars. This looks very similar to the old dash when applied properly and will last for years.
Regards
Armand

Cool. I have a method that looks nearly stock. The first part is identical to yours, but I use urethane sealer to fill the cracks. It does not shrink. Then I solvent clean with a benzene or heptane based solvent to degrease. At any good upholstery shop you can get the headliner material that covers the A and B pillars in your 411/412 (take a look at it). You can get it in black and white. It is very thin. Use two layers of contact cement...with the dash out...which is very easy to do, and roller and squeegee the material into every nook and cranny, starting from the winshield side with the 3 plate removed. You can paint it with vinyl armrest paint (which is permanent) if it is not black enough. Be sure to do the radio grill and ashtray at the same time. It looks like factory. Ray