For cheap Fleximent...
Flexament is diluted Goop or Shoe Goo. The thinner or solvent is Toluene (Toluol). You can have a lifetime (almost) supply of flexament for about $10. Ace Hdwr. sells Toluene in a quart can for $5-something. A tube of goop is about $4. Squirt some goop in a glass container, then pour in some toluene, and mix it up, let it sit, and mix again until it's dissolved, and you have flexament.