Painting Problem Questions

It does not sound like you are doing a wet on wet, in other words you are not going to top coat the epoxy the same day. This means you will have to sand it at some point in the future before you spray on primer/sealer. Having a little orange peal in the primer is not that critical because as I said you will have to sand it and you can make it smooth before top coating. To help you spray it on smooth you should reduce the epoxy. A good rule of thumb would be a mix of 4-1-1. Using a HVLP gun will also help you save product as it reduces the overspray. The manufactures recomendatons for mixing are usually on the can or you can find it on line. Hope this helps