It sounds like you have acousical, interlocking tiles for a ceiling but I can't tell from here. If you have any extras or one that can be removed, take it, or a small sample, to a local PAINT RETAILER (found in the Yellow Pages under PAINT - RETAIL) and ask them. I have the feeling that you might be Out-of-luck. These tiles are very 'fibrous' and such. BUT, in any event, the Retailer can tell you what's up with it.