Re. "going commando" - A gentlemen doesn't tell.
I just wear trunks (AmE: "speedos"). "Rash guard", is that a lycra vest or 2mm neoprene vest? No, I don't use one. I think the idea with open-cell wetsuits is to get them to stick to your skin & keep out the water -- & it works well. I am not sure if adding extra clothing would help or hinder (perhaps one of the lady divers would know better?). Certainly with a 5mm open-cell spearo suit, I would not want any additional insulation -- plenty hot enough already.
Nor sure about sunblock. Obviously you don't need it while wearing the suit. A key property of neoprene is its resistance to oil (unlike regular carbon latex rubber) - I wouldn't push it unnecessarily but I wouldn't be too worried about occasional exposure either, just clean it off afterwards. Several wetsuit companies actually suggest using baby oil (mineral oil) to help get suits on. However, some suits are made with adhesives that are affected by oil (there is an example of a suit coming apart in one of the old threads) -- although neoprene-based glues are readily available.
Nylon linings are a different matter. I believe nylon is degraded by exposure to oils. (I believe climbing ropes are made from a type of nylon -- you generally keep them well away from oil, petrol, batteries,...).
I just wear trunks (AmE: "speedos"). "Rash guard", is that a lycra vest or 2mm neoprene vest? No, I don't use one. I think the idea with open-cell wetsuits is to get them to stick to your skin & keep out the water -- & it works well. I am not sure if adding extra clothing would help or hinder (perhaps one of the lady divers would know better?). Certainly with a 5mm open-cell spearo suit, I would not want any additional insulation -- plenty hot enough already.
Nor sure about sunblock. Obviously you don't need it while wearing the suit. A key property of neoprene is its resistance to oil (unlike regular carbon latex rubber) - I wouldn't push it unnecessarily but I wouldn't be too worried about occasional exposure either, just clean it off afterwards. Several wetsuit companies actually suggest using baby oil (mineral oil) to help get suits on. However, some suits are made with adhesives that are affected by oil (there is an example of a suit coming apart in one of the old threads) -- although neoprene-based glues are readily available.
Nylon linings are a different matter. I believe nylon is degraded by exposure to oils. (I believe climbing ropes are made from a type of nylon -- you generally keep them well away from oil, petrol, batteries,...).
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