Use the model year specific Call Out Sheet or information from 
any of the Sealant Guides which may only provide a Winnebago part number. Listed 
below is the description of the actual type of sealant being specified.
  The "urethane" caulking can be replaced by a commonly available 
  "polyurethane" caulking available at well-stocked hardware and paint stores. Expect 
  to pay about $5 per caulking tube. Do NOT use the much cheaper "latex" based caulks 
  such as Dap, etc. 
  I feel confident in saying that the differences in the three 
  or four types of butyl tape specified above all related to the thickness of the 
  tape and the width of the tape. I do not yet have that specific information. The 
  butyl tapes may be a little harder to find except at the largest well-stocked 
  stores or you may try a local glass shop as these tapes are commonly used for 
  setting glass windows. Most rolls of butyl tape are either 25 or 50 feet long 
  and will cost anywhere from $5 to $10 per roll.
  The "self-leveling silicone" is only available through your 
  Winnebago dealer or any other RV dealership or RV specialty store for that matter. 
  Prices vary widely and the minimum size is usually a one gallon container.
  In all instances, I can not stress the importance of thoroughly 
  cleaning the surfaces to be resealed. All traces of dirt, oil, and any other debris 
  must be removed in order for the sealant to adhere properly.
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