Hey Lisa! As long as you’ll be finished spraying your polyurethane by the end of the day then no, you don’t need to clean your sprayer in between coats of poly. It can sit for several hours between coats if needed during the day and just be fine. But you will want to clean it out before it sits overnight. Hope that helps!

I have no idea about paint pens. Sorry

I haven’t used the triple thick poly. But I would guess that you would want to thin it out more. You can thin it a little bit and then test it out. And then add more water if needed.

Hey there!
I’m proud of you for taking on the project!
1. I prime every piece. Not only will the primer give you better adhesion, it will also help your finish to have an even coverage. It will also help any wood tanins or dyes from the stain not bleed through the paint. But you have to use the right primer. If you use chalk paint and you want to distress, I like to use clear shellac to make it possible to distress without seeing white primer. Shellac based products and oil based products are about the only thing that will really block bleedthrough. They also provide the best adhesion. IF I don’t use clear shellac, I use BIN shellac based primer.
2. Over paint, I use water based polyurethane. I stay far far away from minwax polycrylic because it tends to yellow more than the Varathane brand of water based polyurethane.
Best of luck!

1) To prime or not to prime, that’s is the question ?. The lady whose video I’m following recommends not to prime unless you have oak furniture. I have no idea what kind of wood furniture I have. What do you say?

2) Water based polycrylic or polyurethane? The lady recommends ploycrylic. Thoughts?

Thank you!