Repair notes for bonded seals

Required special tools: 

• 00 9 327

1 General remarks on handling rubber seal profiles: 

• If seals reveal partly detached protective film on delivery, they must not be bonded.
• Store seals at 5 °C to 40 °C.
• If the protective film has been removed during handling before it has been bonded, it can still be bonded.
• Adhesive bond at a room and object temperature of 25° ±5 °C. Temperatures between 40 and 50 °C increase the initial adhesion substantially.
• Seals that are subjected to a temperature above 80 °C after being bonded are very difficult to disassemble again.
• Maximum storage time for replacement: see the identification of the expiry date on the packaging

2 Damage, repair and replacement 

A partially released bonding (rubber component, adhesive tape or adhesive tape paint) up to 120 mm may be finished. Continue with Point 2.1.

A partially released bonding (rubber component, adhesive tape or adhesive tape paint) above 120 mm may not  be finished. Gasket must be replaced. Continue with Point 2.2.

2.1 Repair of partially released bonding (rubber component, adhesive tape or adhesive tape paint 

2.1.1 Clean faulty areas

• Release adhesive area of paint side from recesses and degrease with cleaning agent R2. Stick to air drying time > of 1 minute. Never use paint thinner!
• This will usually partially destroy intact edge adhesive areas.
• When removing, it is important to wipe off the adhesive area of the adhesive tape with a lint-free disposable cloth, (e.g. blue Kimtex)
• Carefully wipe off the adhesive areas.
  NOTE: Use necessary cotton- or fluff-free paper towel once only.
  Do not touch the adhesive area after cleaning.

2.1.2 Apply adhesive

• First apply a paper-thin layer of profile rubber adhesive evenly to the seal, then to the painted surface.
• Stick to air drying time of 2 to 3 minutes.

  NB: 

  Avoid contact with skin!

  Do not apply adhesive to visible painted surfaces.

2.1.3 Press in rubber seal

• Press down gasket using contact pressure (forced pressure not necessary) for > 1 minute.

  NB: 

  The adhesive bond is not ready to have pressure applied until a time of 2 min has elapsed. This waiting time is absolutely essential.

2.2 Replacement 

2.2.1 Peeling off the faulty rubber seal

Courtesy of BMW OF NORTH AMERICA, INC.

• Remove bonded connection with fingers or cleaning agent liner 00 9 327.
• Overstretch gasket below an angle of maximum 20° very slowly under even tensile stress.

  If the seal is removed too fast, the adhesive tape can tear and leave residue on the painted surface.

  The adhesive tape remaining on the painted surface must be removed with high cleaning costs.

  NOTE: If the adhesive tape detaches from the seal, the adhesive tape remaining on the paint must be completely removed from an area of approx. 10 mm until it is easy to grasp.
  Detach the adhesive tape by pulling strongly at an angle of approx. 20°.
  When existing gaskets are being peeled off with a hot air blower: Do not damage paintwork.

2.2.2 Clean bonding surface

• If necessary, remove the adhesive tape residue with an eraser disk or solvent cleaner R2. Do not damage the paint. Stick to air drying time > of 1 minute.
• Before a new bond, treat the entire adhesive area with Sika Aktivator 205. Stick to air drying time > of 1 minute.
  NOTE: Use necessary cotton- or fluff-free paper towel once only.
  Do not touch the adhesive area after cleaning.

2.2.3 Detach protective film of the bonding surface

• Detach the protective film off of the new gasket by approx. 15 cm using the lug.

  NB: 

  If the protective film is removed, the exposed bonding surface must not be touched under any circumstances.

2.2.4 Apply rubber seal

• Manually press on the gasket continuously while detaching the liner slightly at the same time.
  NOTE: If the seal is positioned incorrectly, it can be removed, positioned, and pressed on again.
  Always make sure that the bonding surface is not touched with fingers or otherwise contaminated.
• Press gasket while shifting in a straight line without compression or over-stretching.
• When installing the seal, press it in at the edges. Do not stretch it under any circumstances, (critical area)

2.2.5 Establish sealing joint

• Where the beginning and end meet, a mark is created from pressing the loose end onto the beginning of the gasket.

  Cut off the gasket vertically along the marked line (use sharp knife or special scissors) and press in place.

• Visually check the pre-bonded gasket.
  NOTE: Small areas of gasket can remain stuck to adhesive tape of loose end.

2.2.6 Press gasket

• Always press gasket vertically to the bonding surface
• Manually press gasket or hand roller
• Adhesive tape width up to 5 mm, contact pressure > 5 N/cm2
• Adhesive tape width up to 10 mm, contact pressure > 10 N/cm2
  NOTE: Applying firm thumb pressure generates approx. 35 N/cm2 of pressure.

3 Checking the rubber seal 

• Check the bonded seals for correct positioning and flawless adhesion. The adhesive bond can be tested by pressing back the sealing lip.
• The force used to peel off the seal approximately 15 min after adhesive bonding must be greater than 10 N/cm 2.