Alot of work you have put into getting the right shape etc for your lights.
Suggest if you are going to sell these to other interested parties you get your mould done by fibreglassers or an Engineers Patternmaker who will also setup mould for you.
I was a Patternmaker for 15 years so speaking from experience, if you want to look at marketing these
getting the mould perfect is a must.
They will make a 'master' of your finished product so once your mould starts showing sign of wear they can make another very cheaply without having to do it all over again.
You will make back in sales well more than the cost of a professionally made mould.
Sounds like you've got a few sales already !

suggest you contact a resin retail outlet and ask for PVA release agent for polyester resin.
heaps easier to use than beeswax. Just paint/spray it on let it dry then when you release the mould it just washes off.