The first coat was done just 12 hours after applying the second of two Marinepoxy epoxy coatings with medium hardener on back to back evenings. This way I avoided having to sand either of the epoxy coatings.
I used an inexpensive Wagner Fine Spray HVLP sprayer:
- Thinned the primer 20% with 50/50 mix of isopropyl alcohol and distilled water per the System Three application guide; and
Set the sprayer to the highest flow rate of IV.
The only significant lesson learned was that on the outside hull I will attempt to lay down more paint on the first coat. I'll have to do this by moving the sprayer more slowly. This may prevent the orange peel finish that I got.
The orange peel affect is insignificant enough that I actually rather like it for the inside, and would consider not even sanding the primer because it is very even as is. But I'll sand as needed for adhesion of the paint and as practice for the outside hull in case I again get orange peel there.
The above photos were taken 12 hours after the last primer coat. The primer was still very slightly tacky at this point. This is longer than you might expect from the product literature, and is probably due to the fact that I laid the primer on epoxy coatings that had not yet fully cured. So the combination is likely lengthening the primer cure. Twelve hours after these photos the primer was hardening up nicely.
- The four coats used 8/10 of a gallon of primer.
Stirring the sediment from the bottom of the can of primer prior to application was harder than dredging New York Harbor - I've done both.
I strained the thinned primer as it was poured into the sprayer - that was really easy.