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I think most companies do a pretty good job of keeping their technical data up-to-date. If you browse the link from Jason above, you'll see that most of the PPG tech sheets (P-Sheets, if you will) are fairly current and most span the last few years. I seriously doubt there ever was a P-Sheet for the OMNI MX190 cleaner to begin with. Where I have found sheets that are out-of-date is from sites other than the manufacturer. I used to link to Tri-City Paint for the tech sheets for PPG because I thought it was easier to get to the right sheet quickly at that site. I found out I was wrong to do that. For instance you can't even get the sheet for MP170 epoxy primer there. It has been in a "temp. unavail" status for a couple of years now at that site. Not so when you go directly to the PPG site. I've noticed that Tri-City links to PPG for the sheets - but - they are linked in such a way as to not always get the latest version. For instance with OMNI MP176 etch primer, the sheet you get linked to from Tri-City Paint is dated 6/2000 while the one you get directly from PPG is dated 1/2002. It's clear to me that PPG doesn't want you to get their information via third party sources. They changed the file name for the newer version of the MP176 and now use Java Script to access the tech sheets from their own site in order to discourage direct linking from outside sites. Sooo, the best, most up-to-date information is available directly from the manufacturer of the product. Any other source should be considered suspect. As far as the polyester body fillers are concerned, PPG markets some in their main product line. At least they have a PPG label on them. They even have a tech sheet for them, which I think is nice but rather odd. Most simple body fillers carry the minimal instructions needed on the can label and don't have a separate tech sheet at all. I must say I have never noticed any PPG fillers on display where I buy my PPG products. There are enough competitive manufacturers like Evercoat, 3M and the Bondo Family to make a dedicated PPG filler a slow mover. They probably also carry a premium price just for the PPG label. I think the stuff is all basically the same anyway - polyester. There is a difference between the fillers and the putties however, like the 3m Finishing Putty. While both are polyester, the so-called "finishing putty" is a little smoother, less likely to create pinholes and is not as thick in consistency as the normal body filler. I wouldn't trust the counter salesman to give you reliable advice. It's understandable that they would push their own products rather than a competitors but many do not even know much about the things they are selling themselves! You really have to know basically what you want to buy before you even go to the counter. That's why the manufacturer's tech sheets - at least to the extent you can get 'em - are the best way for anyone to browse what's available, see what's likely to be compatible and what's not and decide which of many different products may be best for any particular job. Someone coming in cold with no prior knowledge in automotive paints can easily be confused and even deceived because of the multitude of different possible combinations from many different manufacturers. The internet, manufacturer's websites and painting discussion forums have made the situation a lot better for the DIY to get information and a variety of opinions to choose from.
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