Have Glidden changed paint formula this year?

Bought 3 tins of Glidden Seed Pearl 3 months ago, and used a tin last night and realized it's a SLIGHTLY lighter color as a year ago. Got an old tin out , and number formulas are different. Took them back to homedepot, where I was told the numbers are different cos Glidden change their formulas every 10 yrs or so...even though they call it the same name...huh..sound right to you?Have Glidden changed paint formula this year?
Actually, yes, it does sound right. I'm actually a QA Manager for one of Glidden's competitors. It is very likely that the formula changed. Could have been a change such as a raw material difference due to a supplier or cost savings, reduction of VOC (volatile organic compounds) per government regulations, or just plain old product improvement. As far as the slightly lighter color, that can be due to several reasons such as you using two different lot #s. One lot can be on one end of the spec and the other on the opposite end. We always recommend mixing different lot #s to have a more uniform color when applying your paint, but in your case that would have been impossible. After a year, touching up an area usually result in having to repaint the entire area with your new lot #.Have Glidden changed paint formula this year?
Don't know about the formula changing but paint differs in shade/color from batch to batch. That's why it's recomended that you mix all the ';tins'; together before you start to get a consistant shade/color.

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