When you cock up the spraying, never be tempted to try to blow it out, fill in around it or anything else - move on, wait until it's hard then fix it. You will make it 10 times worse otherwise. And be patient between coats, go in the house for a cup of tea. painting outside in the summer is doable on the right day.
Edit to add - if this was my pride and joy I would ask a mate to apply the paint, and happily pay him/her...
I‘d caveat the use of a blow gun at 90psi from 2” but use of spray gun partially triggered is fine.
I've resprayed a few things at home, did the back of my Navara a few years ago in its original colour and no-one has ever noticed the difference. Seems I have a similar DIY setup to the one you have so maybe some help.
1. You will never get a professional finish no matter how much time you will take.
2. Work out how much time you think it'll take and times it by 10.
There'll be a lot of people telling you not to bother at home but I found it very satisfying and even after the equipment (though already had a bit of it) was still cheaper than pro.
Metallic Blue - You'll need a 2 pack clearcoat for sure. For solid paint you may get away with all 1k, put would still recommend 2k topcoat.
Compressor is the same spec as mine - it kept up okay but I didn't run the air-fed mask off it at the same time. I'd go bigger tank if I could afford it.
Yes for 2k you absolutely definately need an air fed mask. I ran an a cheap air-fed mask off a separate 50l compressor outside the shop. I wasn't happy with the filters that came with the mask so put a separate 3 stage filter in the line before the filters that came with the mask. Had to shave my beard as well A bigger compressor would run both so long as the intake is well away from the paint fumes.
Maybe someone has had some good results?
I did:
Bare Metal (had it sandblasted)
Body Filler
2K Epoxy Primer
Fine Filler and sand back
Another layer 2k epoxy
Sand back
2K filler Primer (this stuff is really nasty but was brilliant)
Sand back
Water Based top coat (this is gonna be a controversial one) - Mist coat and immediately a couple of top coats wet-on-wet
2K clear coat
Wet sand and polish when clear's cured
With various anti silicone cleaners and tack cloths used as needed between each stage.
I've never had a problem with express-paints.co.uk, lechler is my go to brand.
The problem you'll find with your garage set up (especially here up north) is it'll be too cold and damp. 2k stuff really needs dry and above 25*c. Indoors would be far better.
I used a cheap gravity fed with a 1.8mm tip for the primers.
DeVilbiss SLG-620 with a 1.3mm tip for the top and clearcoats. Would have a separate one for each if I were richer lol!
Thousands of youtube videos on how to set up and use these guns.
I've not used HVLP. Some paints are designed for them though, so be careful.
Guns usually do not, you have to buy them separately. Compressors and water traps do but they don't tend to be accurate enough for spraying. Make sure you don't confuse a water trap with an inline oiler!!! As Dom said, fine control right on the gun is key, after the losses in the filters and fittings.
With good results I ran:
Compressor (reg open) - Clean airline - water trap mounted far higher than the compressor - straight into 3 stage filter - Prestinely clean airline - Gun with regulator attached.
I used the regulator on the gun (bought separately) to set the working pressure. Mostly machine mart / silverline quality stuff except the decent spray gun.
Using clean airlines is paramount, don't use the filthy oil-contaminated airlines you use with your impact gun or you'll ruin everything.
The biggest thing I'd worry about if I were you is the garage set-up, but maybe you can improve on that or catch some rare good weather!
Final note: The paints etc. that you buy will all come with data sheets showing temparatures, mixing ratios, overlap and, crucially, spraygun settings - read them and digest them! Strip down and clean your guns meticulously, immediately after each use, without fail!
I found this forum and careful use of youtube to be invaluable.
I don’t think the 620 is water compatible.