I just found this thread, two days after I ordered opticon to fix a fracture in the making in a lovely piece of opalized wood that I am in the process of cabbing. If I read everyone correctly, using opticon or another "stabilizer" at this time (just finished 100 grit wheel) will not work. Are there any suggestions for a cab that will likely break unless *something* is done?
if the fracture is too hairline to get much resin in (although epoxy diluted with acetone might penetrate) then I would recommend backing the cab - like with a thin slice of black jasper. Opticon may conceal the fracture and the backing will prevent breaking.