Hey guys, just a quick question regarding g/flex. When being used to glue wooden scales (possibly with kydex liners) onto a full tang knife, which of these two is better? The 650 or the 655? I had read somewhere that the 655 might be slightly stronger, though I'm clueless as to whether that is true or not. Being that 655 is thicker, is it harder to work with? Thanks for the help!