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As someone who has recovered a few dashes (although not with Classic 9's kit), I will offer this...
Do not skimp on filling and sanding the dash before putting on the new skin. Every flaw will show up through the new material. EVERY flaw. Even flaws you cannot see or feel WILL show up. It is important to get it as smooth as you would if you were going to paint it. Again, do NOT skimp on this step. You will regret it. Also, you need that foam. It will help conceal the flaws you missed and prevent them (or minimize them anyway) from showing through.
As for what to use to fill the cracks, I use Bondo. Grind out the cracks, apply bondo, let cure, sand. Sand some more. Paint it so I can see how even it is. Apply more bondo and sand again. But also, I have never removed the old vinyl before doing this. I keep it in place because it's a) easier to apply the new vinyl to and b) provides a better foundation that just foam.
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