[QUOTE=jtgain]
Why would a clerk in a paint store know the answer to that question? Nothing against paint stores clerks at all, but does she think Lowes requires a Biology class before selling paint?
[/QUOTE]
For real! Full disclosure: Admittedly, the company I work for is not a big box - we make our own brand of paint, and many customers understand that we are rigorously trained to know how our paint works, we’re regularly “tested”, we do hands on projects to learn how/why one product works better/worse/equal to another, and for the most part, we’re pretty well educated about our own products. We’re an ESOP company, and it pays to know our stuff. I can stand there and explain to customers about resins, titanium content, glycols, light reflectance values, and explain exactly why that red colour you just adore is going to take several coats and be tacky for several weeks until the cows come home… but the anti-microbials? I’ll have to send them to our chemists.
So while I somewhat understand she felt she could ask a more in depth question, well, that was still a little much to expect, I think. You guys are right on the money: co-worker gave the best answer he could. He’s an Art student, for chrissake! :smack: All that means is we give him most of the matches. 
Thankfully, most of our customer stories, while mildly amusing, are never much more than simple, understandable ignorance of the subject. Hell, when I started, I thought you just handed people a bucket of paint and a brush and sent them on their merry way. So I can’t blame them for not knowing why something requires a white base or neutral base, or why you shouldn’t simply buy flat white paint to slap over your unprimed dark blue bathroom walls, or why that throwaway chip brush is not going to give you as good a coat as say, a Purdy brush.
Ultimately, I suppose I should be happy a microbiologist came to us for such enlightenment. I should learn from this. I ought to give the chemists a call and ask them about anti-microbials. The next microbiologist who comes in will absolutely plotz. 