Repaint urethane over enamel?

Allis B, chassis castings and engine were derusted, cleaned, and painted with rustoleum primer, TSC enamel with hardener 10 years ago. Sheet metal was stripped and Jasco pre& prime used to kill rust. Was never assembled. Parts are now dirty, paint that was with the tractor has set up. Paint on chassis is on well. Would like to finish this up but not happy with dry time and glass of Majic etc. Would suspect I would get better results out of acrylic urethane single step.

My current plan is to pull it out and wash it with mild soap (it's not greasy just dirty), scuff with maroon Scotchbrite, W&G cleaner, apply a sealer coat of epoxy primer, then paint inside the window (to avoid scuffing the sealer). On the other parts, rust repair if needed / possible, electrolysis on some of the delicate / rare stuff, sandblast remaining castings, phosphoric acid wipe followed by rinse and wash down. W&G remover, then epoxy prime and paint.

How's my plan?
 
I wouldn't use urethane over what you have. Urethane is temperamental and costly. If it were me I would take it down to bare metal and use a epoxy primer.
 
like stephen said, i would not recommend it. you have waaay to many incompatible products coming together. choose a paint line and stay in it start to finish. a single stage urethane start to finish, will set you back 450 to 800 depending on the product. putting that over alkyd industrial enamel with rustoleom primer is not going to work.
 
My issue was the 10 year old part can hardened and I can no longer get the same formulation and color (newer stuff is more red). Stripping it back to bare metal is probably the right thing but this chassis is very nice, stainless polished bolts, everything was resealed, regasketed, etc. Hate to take it back apart. At this point I'll probably buy acrylic enamel and do a scuff and shoot.
 
It's a tractor. if you are going to show it and want to win best in class, the recommendations here are right on. If you just want the tractor to look good without spending a fortune and spending the rest of the summer getting it done, your approach is OK. Go with a good acrylic enamel rather than a urethane paint. if you follow your plan and your original repaint is 10 years old, adhering well and you do not have a thick buildup of old paint, you will most likely be OK. Also, If you are not showing your tractor, I personally have been using mail order paint from places such as Kicker, excellent product, paint for cars, TCP Global, Summit and Eastwood with very good results and incredible savings over local name brand suppliers. Allis orange is available from of of these suppliers. I have also used the best products from PPG, Dupont, and Sherwin Williams. I am preparing to paint my 55 ford f100 with a base coat clear coat kit from one of these suppliers. Best of luck
 
It's not really a tractor any more. It would be an epic failure at a tractor show. Polished stainless fasteners, braided hose, polished governer cover, custom loader mount plate on front of engine, Chevy valves (still looking for a good roller rocker conversion....), etc. Started working on it when Chevelles got too expensive, got sidelined with my dad's last tractor (also a B and very much in 'working' clothes), and with the kids' activities. Now I'm almost done with dad's tractor and want ot finish her off.

But acrylic enamel looks like the best bet.
 
not a tractor. With this much time and effort invested, and considering it already is not original, maybe you should consider urethane. prepaint sealers are available that will stop penetration/lift into the previous coats and minimize sand scratch swelling. In earlier times, some of the first urethanes to market required these sealers to be applied just before applying the paint. 35 years ago applying these paints over existing paints was common practice by commercial body shops and done mostly without problems. I painted many in this way. Use a sealer prior to applying the paint. the paint will lay down nicer with even color and without sand scratch swelling.
 

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