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yesteryears ply had ball's... good wood unlike todays garbage they call wood...cdx ply.maybe 4-5 layers..fillers are junk..made for cover sheets on large areas....underlayment is as close to the old ply one can get..upwards of 6-7 layers..made for bath and kitchen floors where water could be a problem..good strenght here....moving on to marine ply..again many layers,,but! it comes in or use to come in much larger sheets..up to 16' long for boat building..boat=marine,hence the name.....onto pt ply..made from hard yellow pine/90% pitch..whats to rot with that combo..the green color is just a sales pitch,but it made it last a wee bit longer.......all plywood has exterior glue...the sun beating on any ply will cause hundreds of tiny splits which opens it to water which in turns helps peel whatever you put on it....best to just not hope for many years of care free useage without keeping up with upkeep.
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