after you've got a bogged up smoothed / finished panel / part , give the panel a good spray of auto paint primer - then apply two rub coats of wax formula (leave overnight each coat of wax).... then with the mould release gel - best to put it into an old spraygun for application , this way it goes on evenly and doesn't leave "lines" like a paintbrush would... otherwise you will have ridges when you 'pop" the moulded panel.
When you come to applying initial resin layer on top of wax & release gel - put two good coats on (leave 1st coat overnight to cure) before placing matting on.
Get yourself a brass resin roller (bunnings have them) tip is to keep rolling the resin into the matting until it goes opaque (it starts off white same colour as the matting) AND keep rolling to get rid of all air bubbling which can occur.
For separating new panel from mould - get a plastic plaster spatula and gently prise somewhere then get your air compressor with a air nozzle and spray jets of air in the area around that - it should crack it apart for you easier mate.
Get back to me if you need more info - glad to help if I can Steve
*** get a tin of Acetone for clean up of resin from tools & self!
