excellent videos William.
One thing we didn't mention was how much paint, how thick etc. The only thing consistent about rustoleum is its inconsistency in thickness. Sometimes new out of the can it can be sludge, sometimes reasonably thin. I was working with sludge black this morning on second coats and it was tough sledding, but still effective. Experience will teach you more than we ever could, but but normally you paint right out of the can and you're fine. First coats are more or less a base, the coverage is usually kind of spotty depending on your speed, temperature and humidity. I'll say this over and over again, but always use gloss oil based enamel for your glue. It not only stays wet much longer, gloss is more durable. You don't want the paint on so heavy that it's running, but once I've put on the first coat, I do brush out everything to catch any runs and even out the paint. The first coat is your base, when you start doing second coats, you want to saturate the flocking, but not flood it, smooth it out to where you can see the fibers, you can even set it aside for 5 minutes to let the paint settle before flocking.
The nice thing about flocked decoys is you can use gloss paint, both to flock and to airbrush. In saying that, use the same oil based enamel, thin it a bit with 100% mineral spirits paint thinner. That's where the judgement comes in, getting it to the right consistency to flow through the airbrush is kind of a feel thing rather than a percentage thing since the paint out of the can is so inconsistent. Usually if I can get it to flow through my paint filter it's thin enough to go through my airbrush. You will fight with your paint bottles, especially if you don't paint regularly. There is almost always a skim over the top of the paint in your bottles that has to be cleared, then the tube in the bottle will probably be plugged and maybe even the cap friction coupling. It's just part of the process and it's not uncommon for me to spend an hour clearing bottles before painting. It's not as intimidating as it sounds, just part of the deal. Somedays it's as if the airbrush is a bear cat, sometimes it's like it's an extension of your eye and you just have to think the paint onto the object.
I will recommend a paasche VL with a #5 head assembly and needle. They are reasonably priced and pretty straightforward to take apart and clean. the vl5 loves pushing oil based enamel, which is a fairly heavy medium as far as airbrushes go. Once you get accomplished with an airbrush, the vl5 will do fine lines as small as 1/16th to a wide spray of an inch easily without doing anything other than moving the button back and forth. When you get to that fine detail we can talk later, don't need to give you information overload.
here are some links for sources. airbrush equipment, the best prices and best service --https://www.midwestairbrush.com/
Bottles are pretty spendy if you buy the paasche bottles. I generally get these bottles on amazon and consider them disposable.
https://www.amazon.com/dp/B00BTAOBDC?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_1&th=1
paint filters. I frequently filter my airbrush paint and keep these on hand
https://www.amazon.com/dp/B07XHSC44C?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_3&th=1
I use these brushes for flocking second coats.
https://www.amazon.com/dp/B0BWNHXZJJ?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_3&th=1
I use this brush from walmart for bigger areas of flocking especially first coats. I keep it in a can of mineral spirits and use it for hundreds of decoys over the course of several weeks.
https://www.walmart.com/ip/GOOD-1-5...1?classType=VARIANT&athbdg=L1102&from=/search
something else you will no doubt run into with rustoleum is the paint claboring up in the rustoleum can and virtually unusable. I get some regular coarse steel wool, kind of pull it apart to open up the mesh and make a depression in it over a container, then mix up the cruddy paint, maybe adding some thinner pour it into the new container through the steel wool. Rustoleum is fussy stuff, but it's the best paint for the job, however it's too expensive to waste. I'm beginning to ramble, but maybe you get the idea.