The foam was next to impossible to sand level because of the holes made by air bubbles, and some of the foam would sand down faster than other parts so I couldn't get a nice smooth, level surface. I was about half done sanding the bondo when the dash pad fell off the work bench. Now I have 3 more cracks to deal with. Got so disgusted I decided to strip my other dash pad down to metal and wear down some of my anger and frustration. I was amazed at how poor the quality of the metal is. Granted it was made almost 50 years ago, but I found two of the edges were cut with what looked like tin snips, and buckling in nearly every corner. I guess they figured the foam and vinyl would cover it. I can see that when I buy foam to recover it I'm going to have to buy fairly rigid foam or the imperfections will show thru.