New answers tagged adhesive
Personally, I'd be inclined to drive a pair of small screws, so I could remove and replace the cap if that ever becomes necessary. If you insist on a chemical weld, I would bet that the glues used for PVC plumbing would work. Might be intolerably messy, though.
Lighter fluid (the stuff you put in a Zippo lighter) has worked well for me and lots of tissue. Gaffer tape adhesive is thick and soon bungs up the cloth/tissue so I use centre feed rolls as it is durable enough.
I typically use Goo Gone (US product), will remove most. Rubbing Alcohol is another item that works for some adhesive. Or clorox wipes also works on some.
Super glue might work, although my first thought was to finish the mdf with polyurethane first. This will seal the mdf and allow the adhesive to remain sticky for a long time. Rubbing superglue on the area before the velcro goes on might get the same result too if you don't want to finish the whole thing. I think this is what's going on : the mdf is very ...
I think your largest problem is too-thick (old, perhaps?) cement... although I've never seen such a nasty glop inside any PVC (or CPVC) pipe joint of any size. Nobody seems to have asked whether you ream, as well as deburr, your pipe before glueing... but I cannot think that failure to ream would cause a problem like this. You're using real "PVC cement" ...
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