that's all well and good, BUT....
GM stopped making dashes for these trucks long ago...soooo....the NEW dash that you bought is at least 10 years old...it's been sitting on a shelf drying out just like the dash in your truck...it won't be long until the UV rays react with the vinyl on your dash that's dried out now...it may not seem like it's dried, but I guarantee you it is...that's why I suggest covering the dashes in vinyl...the only thing different is the fact that the vinyl will have to be cut and sewn to fit the dash and therefore it will have seams in it...BUT the vinyl will long outlive the NOS dash that you or anyone else buys from GM...
also, on a side note, we use SEM Color Coat at my shop everyday and it's amazing stuff, but it has it's place just like anything else...armrests and the top of door panels is not that place...it WILL flake and/or wear off...it's just a matter of time...if they were covered in vinyl, they would not flake and the color would not wear off of them...