Underwater Light Coating (ULC)

  • High transparency foul release coating specifically designed for application to underwater
    light lenses and transducers
  • One pack, one coat. Easy brush application
  • Coverage: 70mL tin is sufficient to coat roughly 0.7 sqm of underwater light lens area


  • 70mL Underwater Light Coating
Time to immerse Size Recommended
Coverage (approximate)
At 10°C (50°F): 16 hours, at
20°C (68°F): 12 hours.
70mL Glass and polyamide underwater light lenses.
Surrounding bronze and plastic/composite light fitting surrounds. Plastic transducers.
70mL tin is sufficient to coat roughly
0.7 sqm of underwater light lens area

Surface Preparation

Remove foreign matter by one or a combination of the following:

  1. Brush with stiff fibre brushes.
  2. If heavy shell fouling is present on light surface, clean with Crystilium Hull and Waterline Cleaner.
  3. Grease and oil can be removed with a sponge using a 1:50 dilution of Crystilium Boat Wash in water.
  4. Finally wash down with high pressure fresh water hose and allow to dry completely.
  5. Wipe with a clean cloth soaked in acetone.

Inspect all cleaned surfaces for any contaminants.

ULC application

  1. Apply the ULC using a brand new soft clean brush.
  2. Apply generously, working from the centre to the edges.
  3. Cover all areas of the light lens and any surrounding brass or plastic/composite fitting working systematically to cover all of each lens before moving to the next lens. Apply one coat only.
  4. Check for runs and drips, these can be brushed out for up to five minutes before the coating begins to cure.

ULC Technical Data Sheet

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