Sealants - non-ageing

Conventional sealants such as silicon need to be renewed after a certain length of time. A sealant loses its characteristics when exposed to harsh conditions such as high UV-radiation or immersion in salt water.

Sealing compounds used for caulking of wooden deck joints must possess certain important characteristics: They have to be extremely UV-resistant; they have to retain a high elasticity in tropical and arctic climates alike; they must be capable of maintaining adhesive strength over years of exposure to all weather conditions; and they must remain elastic, even under conditions of continual and varying mechanical stress.

The solution

WKT Sealing Compound is an extremely elastic, non-ageing sealing compound originally developed to meet the stringencies involved in the caulking of wooden deck joints in the yacht and ship building industry. Because of its special characteristics, WKT is also increasingly in demand in other fields of application and industry thanks to its special characteristics.

Product properties:

WKT Sealing Compound possesses a combination of excellent characteristics that has enabled it to stand the test of these demanding conditions for decades:

WKT is a ready-for-use single-component product which is easily applied, even at low temperatures.

WKT type H is self-levelling, having been designed for horizontal joints. WKT clings to the joint’s flanks and flows easily and without enclosing bubbles even within narrow joints, doing away with costly, labor-intensive.

WKT experiences almost no shrinkage while vulcanizing rapidly and without no bubbles.

WKT is extremely resistant to heat once it is vulcanized, remaining flexible even at very low temperatures.

WKT its extreme elasticity – makes WKT more suitable for narrower joints* than other products. Together with our special application method, this results in a substantially reduced consumption of sealants.

WKT is designed to be particularly soft-elastic, so that as the joint expands, there is very little tensile strain on the joint’s flanks. This reduces the risk that the sealant will loosen .

WKT is extremely non-ageing meaning that the material is able to withstand the effects of ozone, UV rays, sea water and temperature extremes. WKT is durable, retaining its elasticity without becoming brittle, even after many years of exposure.

WKT adheres well on its own and its adhesion can be further improved when it is used together with a special WKT-Primer to prepare the surface.

WKT can be perfectly adhering to older vulcanized WKT without the use of primer.

WKT does not contain solvents, heavy metals, isocyanates or oximes and is not designated as a hazardous material. Vulcanized WKT is physiologically harmless.

WKT has proved its ability to withstand the harshest conditions over long durations as a caulking material for wooden deck joints on fishing vessels, training ships, research vessels, freighters, cruise liners, ferries and yachts (please see our reference list).

Due to its special characteristics and its exceptional non-ageing properties, WKT is suitable for long-term use as a joint sealer on joints that are significantly stressed. This can make a significant difference in terms of the longevity of teak decks, mahogany decks and other wooden decks.

If the ship yard, shipping company or yacht owner does not wish to perform the sealing work themselves, we would be happy to recommend experienced companies who can lay and seal the wooden deck, or who can carry out necessary repairs. Please consult us if you require information about the tools and methods required for the removal of the old sealing compound.

WKT Sealant was developed about fifty years ago in Germany by NautiChem, formerly Paul Pietzschke, which produced the first fully synthetic sealing compounds for the yacht and shipbuilding industries. Today, these sealants, which have become known as WKT Synthetic Sealing Compounds, represent the standard for exceptional elasticity and extreme durability. WKT’s use on European naval ships and on many well known cruise liners manufactured in Papenburg’s Meyer Shipyard has demonstrated its ability to withstand continual exposure to the elements.

The Pietzschke line of marine products is also used on renowned vessels such as Aurora, Oriana, Radiance of the Seas, Super Star Virgo, and Norwegian Dawn, among others.