so the slide rests on a UHMW, (ultra high molecular weight) piece of material that is attached to the floor of the RV... the slide moves across this special plastic material... its my best guess that a recessed screw that holds the UHMW to the floor has broken or backed out... thus ripping the material under the slide... and now allows water to enter the plywood and will damage the plywood...
No undercoating will work, as when the slide runs across the sill (UHMW) it will just scrape the undercoating off... the correct repair is to pull the slide OUT of the RV and replace the fabric under the slide... in my case that fabric is black and its the same material used on road construction where a layer of fabric is used between layers of asphalt... funny how you sometimes notice the same stuff used in other applications...
So how do I know this... I helped a friend who had this problem... and the loose screw was what caused the damage..
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Retired Business Owner, Re-manufacturing HD Clutches, Brake Shoes, Air Compressors, Sales & Installation of PacBrake and other Industrial Friction
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