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IndustryABOUT OTTO

Sealing window panes / Glass retaining strip

Sealing window panes is more than just an aesthetic detail – it provides lasting protection for windows against weathering, leaks and structural damage OTTO offers a coordinated system of premium sealants, smoothing agents and smoothing tools – ideal for timber, timber-aluminium, metal and plastic windows.

Step-by-step guide to perfect sealing window panes

For a clean, durable sealing window pane, the right preparation, the right materials, and clean workmanship are important. With OTTOSEAL® sealants and perfectly matched accessories, you can achieve a professional and permanently reliable result.

Preparation – what you need

  • Suitable sealant: OTTOSEAL® S 110, S 120 or M 350
  • Smoothing agent: Gentle on your skin, tailored to OTTO products
  • Skimming spatula: Special angles for precise scraping
  • Cleaning accessories: Lint-free cloths, clean water
  • Expertise: Correct technique for geometry & smoothing direction

Sealant geometry – the joint must be correct

The correct joint geometry is crucial. Only a joint that is precisely adapted to the glass rebate ensures adhesion and elasticity. Ensure the correct depth and width to avoid adhesion problems. Errors such as joints that are too thin or uneven not only impair the appearance, but also the service life.

Smoothing – clean & streak-free

For a perfect finish, mix the OTTO Smoothing Agent with water in a ratio of 2:1. Moisten the smoothing tool with the mixture – repeat this step during smoothing if necessary.

Removal technique – our recommendation

  1. Start at the top of the window and smooth horizontally. If necessary, remove excess sealant from the skimming spatula before mitring.
  2. About 5 cm before the mitre, turn the trowel to 45° in a smooth movement. Continue turning the trowel out of the mitre until it is straight again.
  3. Repeat the process on all sides – for an even, aesthetic joint.

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Cleaning – immediately after work

Finally, after removing the joint, remove any excess smoothing agent (before it dries) to avoid streaks and permanent damage to the glass. Use only clear water and a soft, lint-free cloth.

Recommended OTTO products

OTTOSEAL® S 120

The premium glazing silicone
  • Streak-free and abrasion-resistant
  • Resistant to stress at an early stage
  • Laminated safety glass
  • Very long-lasting joint
Technical datasheet

OTTOSEAL® S 110

The premium construction silicone
  • High wear resistance
  • Very good adhesion on many substrates
  • Excellent early resistance to stress
  • Non-corrosive
Technical datasheet

OTTOSEAL® M 350

The hybrid sealant for glazing
  • Can be painted over
  • Non-corrosive
  • Silicone-free
  • Durable and robust joint
Technical datasheet

OTTO Smoothing tool

The special skimming spatula
  • Ideal for sealing window panes
  • Optimum edge contour
  • Angles: 2 x 90°, 15°, 20°
  • Can be sanded and cut
Technical datasheet

OTTO Smoothing Agent

The smoothing agent
  • Optimally tailored to OTTOSEAL® sealants
  • Ready for use
  • Gentle on your skin
  • Can be thinned with water (2 smoothing agents : 1 water)
Technical datasheet

Do you have a question about “glass - window - façade"?

Our application consultation is available Monday to Thursday from 7:00 a.m. to 4:00 p.m. and Friday from 7:00 a.m. to 1:00 p.m. and will be happy to receive your request.

+49 8684 908 4300technical.service@otto-chemie.comAsk a question

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