well ive always used liquid nails for as long as ive been building boxes (save the last 2 that ive built which i decided, hell might as well give woodglue a shot).
and my stance has always been:
"liquid nails works fine. the joints hold together strong enough that i cant break them by hand" which was true. now ive never kept a box for that long so no joint wear has taken place. i always made new ones.
my friend who recently bought to 18's bl's had a 15" xxx in a box i built a good 2 years ago. the liquid nails worked fine...or so we thought. he took the screws out of the box joints...and the **** wall fell off. not just 1...but 3 of them. no pressure, no pushing, they just fell off.
never again will i claim liquid nails is a fine product to use for building subwoofer enclosures. if your going to keep your box for a very short time...sure...but if you want it to last dont use that ****. my experiences never showed me this which is why i stood by liquid nails and its uses. no more. my apologies to chevyaudio for disregarding his advice and defending my own (although i built these last two boxes using woodglue on account of his suggestion, just to try something new, before this whole xxx box experience)