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I believe he means "going bad" or something similar. The DRR is a reactive reducer used in PPG's DBU Deltron basecoat. As far as I know, that's the only product it is used in, at least officially from PPG. When used with this reducer, the basecoat is "activated" and can repaired w/o the danger of lifting that is common when recoating many basecoats. I used it once a couple of years ago and have almost a gallon of the stuff remaining. As I use single stage for any tractor work, I may never get to use it up. I suppose if it has gone bad anyway, it's a moot point. Too bad - it's pricey, as all products in the Deltron line are. The can label does not carry the "use entire contents within 14 days of opening" caution that the hardener labels do. There is also no indication on the can label or the MSDS that it contains isos. It may be a similar situation to the catalyst used in epoxy primer, but the chemicals are included in the reducer. I used some MH168 hardener in MTK this spring that was first opened two years ago. I don't use an inert gas blanket (like bloxygen) or welding argon, but probably should. I keep meaning to but always forget it when the time comes. I don't refrigerate it either although during most of the winter months it is naturally refrigerated in an unheated shop. There was no apparent problem in using it. It was clear (not cloudy in any way) and obviously not gelled up in the least. The paint film dried as usual and everything appears to be normal with the result. If any reader knows of a way to tell good from bad, either beforehand or after the fact, please advise. The stuff is expensive and those (like myself) who use small quantities and don't use such materials often can ill afford to throw the stuff out two weeks after opening just because PPG says so. I don't know anything about the "One Step". First I have heard of it. He may just be using the term to mean single stage instead of a two stage base/clear. I have never heard of mixing clear in with basecoat to make it a "one step" operation but I suppose one who is not familiar with automotive paints could refer to a single stage paint that way. Even if one could mix the base and clear together to apply at the same time, I fail to see the advantage to doing it over using a single stage in the first place. There certainly is no economic advantage since just basecoat colors appear more expensive than their single stage counterparts in the same product line. That seems to be the case with OMNI MBC base and MTK. I have no idea why that is so. Rod
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