Here's some info from Brownells "Gunsmith Kinks", pgs 198 and 199:
A gunsmith silver soldered a front ramp on a barrel and it took 41-pounds of pull to break it loose. Next he used a product called "Twin-Weld and it did not break loose at the upper end of his scale of 60 pounds pull. He followed that up with Brownells' Acraglas and the front ramp broke away at 55 pounds of pull. The gunsmith said that with the Twin-Weld and Acraglas you had much much more time to adjust the ramp alignment that with silver solder.
Someone in the Shotgun (Slug Guns) used JB Weld to put on a set of bases and rings on a shotgun for a scope mount. There was an article in one of the gun magazines not too long ago that featured Acraglas to mount a front barrel sling swivel.
Oh, I have Gunsmith Kinks, Gunsmith Kinks II and Gunsmith Kinks III and I highly recommend them. Gunsmith Kinks IV is out now and I will order it with my next Brownells order.