Also, warm the epoxy after mixing, and it will thin out. This does accelerate the cure time, so use the longest setting you can find. Can be bad when 5 min. sets in a minute or so....
A club member, who was an adhesives chemical engineer for 40 years, swears by thinning Gorilla Glue with acetone. The acetone flashes off quickly, leaving the straight glue behind. He says it also foams less - still makes a super strong bond that fills gaps, just isn't as prone to foaming out of the gap as much as straight Gorilla Glue. You can also then put electrical tape over the crack, to further minimize foaming out while it cures. (the black electrical tape will not get glued to the crack like masking tape might!).