I put the first coat of top-coat on my '44H (sheet metal) this morning, it's looking good.
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I used 2150 from the Case/IH dealer. Also used hardener with it. I primed, wet sanded with 600 sprayed top coat #1 and will wet sand that with 1500 before spraying the 2nd coat.
 
NO, you should put all coats on with a 10-15 minute wait between coats. Forget sanding between coats -- why are you doing it? If you have orange peel, or lint in the paint (like I get), put on all coats, then sand with 1200-1500-2000, and buff it out. I will say I routinely do that with urethane, not the modified alkyd enamel that 2150 is. I believe the only paint that is sanded between coats is acrylic lacquer, which IMO is the worlds worst paint. For 2150, I do not know the recoat time for recoating if you mess up or decide you need another coat. But since it may have sat too long I would sand with 400 then put on the next two coats. 1500 may not give the recoat enough bite. The can may or may not tell you what the recoat time is. If it does, then that may be the reason you are sanding between coats, but that is not what it means.
 
Remember "recoat" means that if you decide you need more paint after it has set a while, you have to do it before 3 hours have elapsed or wait 2 days. Since you have not put on the 2nd coat, and you used hardener, wait 48 hours, sand it with 400 and put on two more coats with a 10-15 minute period between the two. You are then done, unless you mess up. Then you have to wait 48 hours, sand with 400 grit and add another coat. The 48 hour wait is to prevent the old paint from lifting the new, due to the different stages of drying.
 

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