I'd ask at a couple of recone parts suppliers. I think that brushing on a thinned down rubber solution type of glue should do it. What region of the world are you in?Thanks! What would be suitable doping?
That's something of a judgement call really, depending on how thick the loose section is compared to the remaining cone. If the loose bit is thinner, then probably remove it, eg with a scalpel. If it's similar or thicker, then probably best to stick it down.Also would you peel away the loose material that's not yet torn off? Or stick it back down?
Yes, to help get the PVA absorbed into the paper. Maybe 1:1 or 2:1 ratio of water to PVA. But it may be best to wait for a speaker builder to chip in @Scumback Speakers @TAWeberSo maybe it was thinned down with more water?
Yes. That happens to be red in color but I'm sure it comes in black.