repaint

[smtapaul]

There is a vast ammount of info on this site and allot of advice,this will be my first attempt at painting my smta,this tractor has one coat over the orignal,no rust the paint is in fairley good condition but faded.Only bad spot is the gas tank due to spills,some paint runs from the last poor attempt at painting,hears my plan. Hot steam pressure wash remove hood,grilland gas tank to be painted in booth,rough up exsisting paint with sotch pad and smooth out runs with sand paper,this tractor is used for antique pulls and will be scratched perfection is not nessary.
Paint out doors in a screen room to avoid bugs- dew-and rain during curing.noe the big question,will IH 2150 do a good job and what kind of primer should I use?

Paul.

 

[CNKS]

If it was my tractor, I would go to bare metal. But, if the paint is in good condition you can do as you say, except--I would wet sand with 320 followed by 400 on the sheet metal, then use epoxy primer followed by the 2150. You might not need the 400, but I have never used 2150 (I use the PPG equivalent 71310) and I am not sure the 2150 will cover the sand scratches, it probably will. (You will get a better finish if you use a surfacer over the epoxy and sand it with 400). The epoxy will act as a sealer on the old paint and will bond to the bare metal on any places you sanded through. Since cast is next to impossible to sand, you can probably get by by using a maroon scotch brite pad, then cleaning thoroughly with wax and grease remover. Again, I prefer bare metal, but if you don't want it perfect, that should be ok.

 

[smtapaul]

CNKS.What is the difference between 2150 and ppg 71310? I do not plan on using hardner since I do not have the proper equipment.Thank you for your comments.
Paul.

 

[CNKS]

2150 is an acrylic modified alkyd enamel. PPG 71310 comes in acrylic enamel and both inexpensive and expensive urethanes. Since you are not using hardener use either 2150 or the acrylic enamel version of 71310. Similar results can be obtained with the Nason version of Dupont 96766. Most people seem satisfied with 2150, I have not used it. Acrylic enamel is probably somewhat longer lasting than 2150, but the biggest step up is acrylic urethane, which requires hardener. So the difference is the quality of the paint, but there is likely not a whole lot of difference between CaseIH 2150 and PPG 71310 or Dupont 96766 acrylic enamel, or other manufacturers versions. ALL are superior to the tractor store's paints.

 

[smtapaul]

CNKS.
I am not that familer with any painting,what is surfacer?Also want to know how many gallons of paint,primer,surfacer and how many coats to apply,sorry for all the questions but my expertice is mechanical.Having every nut and bolt engine and transmission you name it overhauled in my shop.
Thank You Paul.
PS. runs like a top just need to put the shine to it.

 

[CNKS]

If you are not using hardener, the PPG Omni number you want is MP 181, it is a "primer" surfacer, it does not give as good adhesion to bare metal (or anything else) as MP170 epoxy, so use it over the epoxy. It is thick and easily sanded, good for filling scratches and very minor depressions and can be sanded and repeatedly applied until the surface is smooth. Problem with it is it is "lacquer" primer, the lacquer can shrink into the scratches after the topcoat is applied, revealing the scratches. The solution for that is to use a urethane surfacer, MP 182, which does not shrink as much, but requires hardener, which you prefer not to use. MP 182 has even less adhesion to bare metal than MP 181, so you about have to use epoxy under it. Just get your surface as free of scratches as you can before priming. An MTA will take at least 1.5 gallons if you use 3 coats, more if you paint the parts separately. If these are the paints you are going to use, please get the tech sheets off the PPG web site. The link shows all the Omni products. Click on "primers and surfacers" and type in MP 181.
Tech sheets

 

[CNKS]

In any event push any dents you may have to 1/16-1/8 from the surface and fill with body filler, before applying the 181, as it will not cover much of a dent at all.