[Paddlewise] filling holes in plastic boats

In terms of plugging old holes, can someone share some opinions of this 
method of filling small holes?:

Simply find a stainless steel machine screw with an acorn nut that just 
barely fits in the hole - better if it has to kind of be threaded into the 
hole.  Add a rubber/fiber/neoprene washer if that makes it seem better to 
you.  Or...use a slightly smaller screw, goop it up with hot glue or some 
other decent adhesive caulk and tighten it down.  I've done this for moving 
my seat and footpeg tracks (fitting a 6'8" frame into a plastic boat that 
is almost big enough!).  Seems to work fine.  It is certainly quick - and 
appears 'normal' from the outside of the boat - many fasteners through the 
hull already.  Might be easier to explain when trying to sell a used boat - 
not sure if the melted plastic fill-ins are noticeable???  Maybe they blend 
in just fine.

Maybe this should only be a temporary repair.

Any thoughts?
Keith

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