Norm,
i did not spend enough time in Ron's (Marigo) room to say anything about which is longer lasting, the Rio or the hair dryer. after three months of using this tweak in various forms typically the greater degree of the percieved tweak effect the longer lasting. regardless; the degree of effect of the RIO-5 would not cause me to use it consistently, not a good enough effort/reward factor. the hair dryer ,OTOH, has become essential.
i have not tried the RIO-5 on Lp's. but Andrew has tried it on Lps on recommendation from Joe Pittman, a local Acoustic Revive dealer. Andrew said it has some effect but not that much.