Yes I restore many pins and I prime first then use all spray cans see if you can match your color first ,make sure with the primer when it drys too see if you have any marks u don't like and you can fix then and try again because when the real paint goes on u want it good for that

I restore pins and I use old base spary cans A lot better doesn't mark easy and stronger in the long run

Yes for sure spary cans are way better nice even coat ,two or 3 times for the best coat

No a real spary gun is the very best for spraying cars but I don't think he wants too do that ,spary cans for him would be great

Yes 400 or higher is better it will blend in better for sure ,then u can see as you go if u need too fix anything

Great are u priming first a few coats ,sand between too see if there's anything too fix before painting

Yes your right keep trying very small amounts as you can too test good viscosity less is better so u don't wast a lot of your paint as for sanding between coats your using water base paint ,I have always used oil base and I wait a day too sand so water base is faster drying time so I would guess 2 too 4 hours longer is always better anyways

Yes when dry sand good too get the orange Peel out and try again ,there's no mixing with the sprayer you have ,I spary with oil base and car paints it's 3.1.1 so it's almost 1/2 not sure about water base all you can do is try a very small amounts too test or just keep try too add water too yours

Looking good getting there looks like u got the mixing closer

Yes wait until your done painting and dry time ,as Passave said ANY little flaw will show though ,hairs flaws in the paint ,lines every little think u wouldn't think it will ,try a off cut on something else too get the hang of it ,I always do the dry way but it's not that easy you only have one time too get it right if not it's too late