Might be your rubber seals. The Del Sol's were known for having this issue in the first couple years they made them. This problem was fixed in the 1995's, 96's, and 97's. Your Honda dealership should be able to fix it no sweat. Not sure if it was a recall or not, but I'd check with the dealership in case it was since they'd fix it for free. Otherwise it was a fairly easy thing to fix I believe, although I can't remember off the top of my head what to do. Try here for some information:
www.teamdelsol.com
They've got a lot of info on the cars. And since your info states you have a '93 Del Sol, here's some recall and service info as well:
http://www.alldata.com/TSB/24/93240677.html