Hey newguy...

You gotta leave at least two of your car windows down 1cm to let the heat escape, as otherwise it can hit 60+ degrees in there and potentially delaminate your board (and for certain melt your wax...).

I used to do this when I was still on boards small enough that I could put them in the back of the Torana! In those days we were still using the board 'socks' type covers... I used to put the board in the car wax side down and chuck a couple of beach towels over the top - 1) to 'hide' the board and 2) to provide an extra layer of insulation...

These days I'd be more worried about theft than damage to the board...

Tint ya windows ,as above drop the windows a tab,get a air com ocean and earth bag or leave the zip open to allow air flow.

Bag I shall try! But I guess board in car on a 40 degree summer day is a no go then. Cheers all maybe I won't look too sus hiding a surfboard under a desk somewhere