Hi guys, I'm working with four drivers from two sets of KLH-31's. Two of them have suffered the Permatex High Tack treatment and I'm trying to reverse the problems that this purple sticky stuff has caused. One of them makes a loud pop in the low Hz regions, the other has an occasional buzzing sound. The treated surrounds are very prone to distort with light and temperature. I used some acetone and cotton balls to strip the high tack and old butyl away and now have super soft/compliant surrounds. Although very few pinholes are noted, this is far from ideal! Please correct me If I'm wrong, but a function of the surround is to hold the edge of the cone steady enough to keep the voice coil from lateral interference with the pole piece. If the compound used on the surround doesn't have a 'memory' it won't work, the cloth is only there to hold the butyl rubber/asphalt combination in place! I've discovered Red Devil Blacktop & Roof Repair Caulk #0636 has a butyl/asphalt combination and it is thinned with mineral spirits. I've prepared one by removing its dust cap and shimming the coil. I'm now waiting for shipment of this stuff. Stay tuned..