Tenco Bottomcoat black underwater coating
A black bituminous underwater coating from Tenco for inland waterway vessels and pleasure craft sailing in fresh or brackish water. Also suitable for houseboats, floating pontoons and other objects in constant contact with fresh water, such as lock gates, sheet piling and jetty piles.
What you use it for
Protection of iron, concrete, wood and aged polyester below the waterline. The coating adheres directly to bare steel, concrete, wood and polyester, and to old tar and bitumen layers. Never use a primer under Tenco Bottomcoat black; it is not needed for good adhesion.
Application
Apply to a dry surface, free of grease, dirt, loose rust and mill scale, with a brush or paint roller. Stir well before use. Thin the first coat or any bare patches with approx. 10% white spirit; then apply two coats undiluted. For maintenance, two undiluted coats are sufficient. Do not apply in full sun, on wood at a minimum of 8 °C and on steel at a minimum of 10 °C (maximum 25 °C at 80% relative humidity). Dust-dry after 6 hours and recoatable after 24 hours at 18 °C and 60% relative humidity. Coverage 7 to 9 m² per litre. Clean tools with white spirit.
Packaging
1 litre or 2.5 litre tin, black.
Please note
Contains, among other things, solvents (hydrocarbons C9, aromatics). Flammable liquid and vapour; may cause respiratory irritation and drowsiness or dizziness. Toxic to aquatic life with long-lasting effects. Repeated exposure may cause skin dryness or cracking. Wear protective gloves and eye protection and work in a well-ventilated area, away from ignition sources. This is a bitumen paint and, according to the manufacturer, not an antifouling paint approved as a biocide; no Ctgb authorisation number is stated. According to the safety data sheet, the product is intended for industrial, professional and consumer use. Read the safety data sheet before use.
Specifications
| Brand | Tenco |
|---|---|
| Size | 1 litre, 2.5 litre |



