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Antique Tractor Paint and Bodywork

Omni MP182 Primer surfacer

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GlenIdaho

08-15-2007 16:12:35

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I'm painting the sheet metal of my 850. After having everything sandplasted, did the body work and then primed with 2 coats of Omni epoxy primer. I then put on three coats of Omni primer surfacer. I was told that I did not need to seal it as it was a sealer, but I've read that you should use an epoxy sealer over the primer surfacer. The spec sheet says you can top coat over the primer surfacer. Can anyone tell me what's best? Also, is there a window for top coating like the epoxy primer has?

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B-maniac

08-16-2007 19:35:10

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Re: Omni MP182 Primer surfacer in reply to GlenIdaho, 08-15-2007 16:12:35

I agree with Rod and CNKS about the sealer not being required. I am probably the one you heard telling about using it that way. I made my living in the auto body and paint bussiness and we had to put quite lengthy warrantee on our paint jobs to stay competitive and since the Ins. Co. would pay for the high end materials to accomplish this it meant we could use the best at their expense and we could reap the bennefits. When cars started going over $20,000 people got a lot fussier. On this forum , we put a lot of options out there from the lowest to highest quallity and prices to match. Everyone needs to find where their requirements fall in there and use the advise given on that particular range of products. Human nature usually takes over and sometimes we are sorry we took too low a road.

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Rod (NH)

08-15-2007 18:26:45

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Re: Omni MP182 Primer surfacer in reply to GlenIdaho, 08-15-2007 16:12:35

Hi Glen,

I agree with CNKS. I've never done it that way but some do as an option to improve the bond with the topcoat - the thinking being that a chemical bond is better than a mechanical one. I won't argue with that but just say that I have never found it to be necessary. There certainly is no reason to "seal" the 182 because of any perceived compatibility problem with the topcoat. As long as you have a satisfactory sandscratch in the 182, the mechanical bond that provides is satisfactory for the topcoat. I have never seen anything from either PPG or DuPont suggesting that it wasn't. Adding a "sealer" coat of epoxy would introduce another time window into the process. Since I do all my painting outside, I have to contend with changing weather conditions. I do not want to introduce any more time constraints than are necessary. I see no compelling reason in this case to do so, having had excellent results without it. There is no time window for topcoating the 182.

Rod

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CNKS

08-15-2007 17:19:14

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Re: Omni MP182 Primer surfacer in reply to GlenIdaho, 08-15-2007 16:12:35

I have read that on this forum also, but don't remember all the details. 170 over 182 will provide a chemical bond between the 170 and the topcoat, just as it does when you do not use a surfacer. It may prevent chipping and add some rust protection -- but I have had no experience using it that way. It is not a requirement, but at least in theory may provide some benefit. 182 is not a sealer, but diluted 170 (per spec sheet) can be used as one. 182 should be resanded before topcoating if it has set for more than a few? days. I usually topcoat it the next day or perhaps the same day after sanding. You are sanding the 182 (400 grit)? It must be sanded or you will not get a smooth finish.

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GlenIdaho

08-15-2007 19:37:44

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Re: Omni MP182 Primer surfacer in reply to CNKS, 08-15-2007 17:19:14

Rod and CNKS; Thank you gentlemen for the quick response. I'm sanding with 320, in fact headed out to the shop now to finish sanding so I can top coat tomorrow if the weather holds. Supposed to have some thunderstorms. As has been said many times before your knowledge and expertise is greatly appreciated. Take care!

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