Very cool story! Will be watching for more!
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Clearly I don't know what I'm doing in this case, basically learning as I'm going. So - now that I've gone to all the work to sand most of it out in 400, will mixing reducer with the primer thin it out enough to lay down smoother on the final coat of primer that will be sanded out in 600 grit?If you are going to reprime why 400 grit? I would have dry sanded with 220 or 180 then reprime. 400 is for final sanding. Nothing wrong with what you are doing just making a lot of extra work imo. I have found in doing production work that laying an extra coat or two of primer then blocking with 180 dry then wet sand with 400 and paint is the quickest way to paint. Been trying different things for 40 years and this works best for me.
Thanks for the suggestions! Any and all help is greatly appreciated.Yes it will help. I am not saying you are doing it wrong only you are doing it the hard way. When you go to reprime I would put a little base coat in the first coat of primer just enough to tint so when you do final sanding you will know if you are getting close to original primer. I find that when sanding filler or primer the very top sands toughest and clogs paper the most. If you just break the top coat with a little courser paper it will sand easier. Just be sure you get all the rougher grip scratches out before top coat. If you thin the primer more you will want a few extra coats extra drying time for the extra solvent to evaporate.
I use a 4 to 1 primer and add just over 1 part of reducer. So 4 to 1 to 1 1/2