Since you built your coop from non-pressure treated wood, just use a flat mistint paint for your primer. I was a custom home builder for years and all of my painting contractors used this for primer for both interior and exterior uses.
A flat paint will soak into the wood that you built the coop out of and will provide a good base for the top coat that you apply. There really is no sense in wasting the money on an oil base primer or an exterior grade primer. They will not make a significant difference in the overall job or life of your topcoat.
I have done this for years on million dollar + homes, and have never had to redo anything. If it's good enough for them, it's surely good enough for a coop!
Have fun!
A flat paint will soak into the wood that you built the coop out of and will provide a good base for the top coat that you apply. There really is no sense in wasting the money on an oil base primer or an exterior grade primer. They will not make a significant difference in the overall job or life of your topcoat.
I have done this for years on million dollar + homes, and have never had to redo anything. If it's good enough for them, it's surely good enough for a coop!
Have fun!