Factory-primed doors, blotchy black paint! *Help please*

[SalKhan]

I recently bought a factory-primed white door from Wickes. I was told by their customer service team that it was ready to paint using a water-based paint. I was recommended their own water-based interior wood paint. However, after two coats I’ve noticed the paint is very blotchy. I painted the doors matt black, and it’s just bothering me at this point. Anyone know how to best fix this?

 

[Nige F]

I've had a google and would suggest Little Greene Flat oil eggshell - your coats of water based, when lightly sanded should provide a good base for the oil paint