What To Use? Repairing Dashboard Cracks

Filling the cracks in a solid plastic dash isn't really the hard bit, that can be done with a flexible filler such as those used on plastic bumper repairs. The tricky bit is replicating the texture, particularly after sanding back the filler as you'll have scuffed surrounding plastic too. I'd say that unless it's a very small, localised repair where a small area of texture can be successfully replicated with a repair kit (I'll dig out a link to the type I've used before), then the best option would be to have the dash flocked afterwards. This does mean the dash has to come out but then if you're going to a proper job filling the cracks, it would need to be on a bench anyway.

*Edit* I just read your post properly and realised the dash isn't hard plastic but a vinyl shell over compressed fibre. The flexible filler and flocking method above would still work. There are vinyl repair kits that could be used on this kind of dash but I've never found them that effective for anything more than very small spot repairs. The finish is often shiny compared to the rest of the dash. You normally get a selection of texture cards which you use to print on the texture that matches your original. Again, I've had mixed success. If someone does have a product they can recommend for such repairs, I'd be interested too.

I don't really want to flock the dashboard, that's going to look weird since nothing else is flocked in the car, and I don't want to make a sun rug either because I'm not a fan of how they look. Sun rugs are the chrome wheel arch trims of dashboards (and best used before the problem happens rather than after).

I wonder if vinyl wrapping might be the answer on this one. The vinyl/plastic coating of the dash isn't heavily textured and does seem to be about the thickness of a heavier vinyl wrap and it looks like it's that coating that's cracked rather than the supporting board, and it has lifted in a few places. Could I remove the dashboard, strip off the old vinyl somehow, and then get it re-wrapped by a professional/company? I know I couldn't DIY it, vinyl wrapping anything more complicated than a small flat board is a skill I have learned I do not possess.

If the headlining board is anything to go by, the dash surface under the grey vinyl/plastic is going to be quite uneven and unattractive, I hadn't considered that. Still, a professional would know what to do about it. Not in a position to waste their time with an enquiry at present so I'll keep hunting for solutions. That said, if you can vinyl wrap a dashboard like this that opens up a lot of interesting options for custom interiors, especially with some of the prints and finishes available now.

That makes sense, that's like repairing a fibreglass crack. That, combined with a vinyl wrap, is probably the best way to get what I want to do then. In theory, at least. Flocking will always wear off eventually if you touch it. If you're doing a low contact area it's fine, but if it's on anything you're in contact with a lot, it's going to get shiny spots before too long, that's just the nature of what it is. At least it doesn't disentegrate under UV like so many DIY 70s velvet interiors.

Looks like it's a dash out job whatever I do and right now, I'm not ready to get that deep into this car. Maybe when I've got the Princess sorted out I'll give it a go, we'll see.