Rubber sealants: description and characteristics

Rubber sealants: description and characteristics

Closing holes, cracks, eliminating various cavities is very often necessary during repair and construction. Even exclusively for domestic purposes, such processing is practiced by many people. This means that you need to thoroughly study what a rubber sealant is and how to use it correctly..


In practice, sealants are not always used neat. Mixed reagents are often used, such as “Titan”, formed by combining rubber with resin, bitumen, synthesized fibers and even a solvent. Such a composition has proven itself perfectly when performing roofing work. Judging by the assessments of professional and amateur builders, this sealant is characterized by high viscosity and perfectly tolerates harmful atmospheric influences.

Basically, such a mixture is needed for the following purposes:

  • closing of the docking points of the blocks;
  • elimination of gaps;
  • updating of previously formed joints;
  • fight against leaking places;
  • increasing the rigidity of gutters and roof windows.

The classic rubber-based sealant, along with bituminous analogues, is used in the following:

  • in the repair of rooms and utility rooms with excessive moisture;
  • when holes appear in inflatable boats and rubber boots;
  • when restoring the integrity of roofing materials;
  • for fixing roofing material and other bitumen coatings;
  • for attaching expanded polystyrene or polyurethane to any base.


Rubber sealants are required to be used only at positive temperatures. No other type of sealing compounds allows you to refuse to clean the surface to be finished. And rubber, thanks to its exceptional adhesion, makes it possible to get rid of this tedious procedure. When the composition is applied, it quickly hardens, becomes insensitive to weather changes.

If necessary, the sealed surface can be repainted in a short time to match the tone of the surrounding material.

Positive and negative sides

Reviews of rubber sealants suggest that they have properties such as:

  • extremely elastic;
  • adhere excellently to almost any building material;
  • prevent corrosion;
  • can be operated in a frost of -50 degrees;
  • stable even when heated to +150 degrees;
  • will last up to 20 years;
  • easily tolerate wind, rain, hail, snow, dew.

But you have to put up with certain restrictions.. So, rubber sealants are incompatible with a number of plastics, because there is a risk of material destruction. The sealing layer, in turn, can be damaged by mineral oils.

Most attractive variety

Liquid rubber Masterteks is famous for its excellent adhesion on wet and oily substrates. It is compatible with bitumen and adheres well to bricks. The positive results of using liquid rubber when connecting the railings to the wall or plaster were noted. This material allows copper window sills to be glued to oak slopes, to seal the bonds between wood and copper, stone surfaces and sheet glass. Such characteristics allow the use of the sealant when closing the borders of decorative panels, in the installation of plumbing and air conditioners, PVC and aluminum insulating glass units..

Liquid rubber can confidently replace compounds based on polyurethane, silicone, polymers and other actively used sealing agents. The resulting layer is mechanically strong, but elastic at the same time. Curing is due to a reaction initiated by the moisture in the air. Therefore, the sealant must be carefully protected from moisture and only opened for use. Subject to proprietary processing technology, even contact with salty ocean water or exposure to ultraviolet radiation will not pose any threat..

Masterteks will not cope with sealing metal coated with a zinc layer. If you seal vertically oriented joints with them, they will not slip..

The hardening time is determined by the following factors:

  • relative humidity;
  • warming it up;
  • the size of the created layer.

Until the mass has frozen, it is easy to remove it with solvents or household chemicals. Solid surpluses are removed mechanically, additional cleaning is done with silicone remover mixtures.

If you have to make extremely deep seams, you need to use a round shaped polyethylene foam cord. The placement of the sealant in such seams is done either with a spatula or with an assembly gun. The second tool is more expensive, but much more productive and more accurate..

Masterteks can be used both in freezing temperatures of -10 degrees, and in summer heat up to +40 degrees. According to the manufacturer, the sealant is resistant to mold and other fungi. The seam formed by it does not allow water to pass through, and at the same time is outwardly invisible. The mixture can be stored at temperatures from +5 to +25 degrees. Resistance after hardening of the applied layer is guaranteed in the range from -40 to +90 degrees.

For information on how to seal the roof with FOME FLEX AQUASTOP roofing rubber sealant, see the following video.

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