I have a mould that i cleaned with the mould cleaner. Then I applyed easy lease, apx 7 coats. 

It is contaminated; by the release agent. That's a common issue with chemical release agents, they are too high slip for brushing gelcoats onto. You can get it to work when sprayed, but brushing is harder. 

This is the age old problem! The better the release, the more likely it is to create such a high surface tension that your resin/gel will shrink back.

PVA is neutral, and the GC50 will sit nicely on it. But you will have the same problem getting the PVA on the chemical release.

Waxing over chemical release will help as mentioned, but you are mixing products which can be difficult!

Spraying the GC50 will work, with a bit of effort in the application.
I spray the GC50 in a fine mist first and then leave it 3 mins, then I spray again and it's much better, another 3/5 mins and the last coat goes on and usually it's now covering completely. It's as if the first layer gasses off it's volatiles, and "settles" a bit. The second coat continues this... and the 3/4th ones are now going down on a "settled" base.

That's what I do, I'd love to hear other techniques though.

I did a new try. Cleaned the mold with the EC mouldcleaner. Then three coats of easy lease and then three coats of megauliars mould wax nr. 8. 

Yes mould cleaner will remove the Easylease. You shouldn't need to use mould cleaner anyway, there's no issue with what is on your mould. The issue is that you are trying to apply a liquid to a surface with very little energy, so the liquid adheres to itself easier than it adheres to the surface. This causes the droplets of liquid to form the shape that requires the least amount of surface area, a sphere or 'bead'.