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Reach—Body Service Manual
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Sealant
Overview
The one-compound polyurethane sealants Utilimaster uses remain permanently elastic (less cracking
due to shrinkage), can be painted, and require no mixing. They bond as well as seal, thus reducing the
number of mechanical fasteners needed and reduce noise and corrosion.
Removing Parts With Adhesive or Sealant
After removing the relevant fasteners, use a razor knife to cut the sealant. If necessary, continue cutting
while gently prying apart the sections. Clean the reusable surfaces with isopropyl alcohol before
applying new sealant.
Applying Sealant
The following statements provide an overview of using polyurethane sealants:
•
Manufacturer’s Recommendations: Always follow manufacturer’s cautions and
recommendations for protective equipment, application, and cleanup.
• Conditions: Recommended application temperatures are 40º [5º C] to 100º F [37º C]. For
cold-weather applications, store sealants at approximately 70º F [21º C] and remove them just
prior to using. Make sure joint is frost free.
•
Surface: Clean the surface with a strong jet of compressed air, sandblast, or solvent. Remove
all loose particles and old sealant. The surface must be clean, dry, free of grease or rust, and of
sound quality.
•
Priming: Usually no priming is required. Since substrate type and uniformity can vary, a pretest
is recommended. Sealant manufacturers have primers when substrates require them. Since
compatibility among manufacturers is in question, do not mix and match different manufacturers’
primers and sealants.
•
Application: Cut the tip of the plastic nozzle to joint size. Puncture the airtight seal. Install with
a hand- or power-operated caulking gun. For best performance, sealant should be gunned in
the joint where the joint slot is at the midpoint of its designed expansion and contraction. Dip a
Polystick in a soapy solution to ease spreading the adhesive to seal any gaps.
•
Limitations:
For curing, permit sufficient exposure to air.
Do NOT apply over silicones or in the presence of curing silicones.
During cure, avoid contact with alcohol and alcohol-containing solvents.
For best results, use open cartridges up the same day.
WARNING: Always wear proper protective equipment when appropriate for the process.
WARNING: Safety and application instructions provided with sealants, adhesives, and other
products should always supersede information provided by Utilimaster.
