Quick answer
- Underwater hull of a vessel, barge or buoy
- DeepSea Anti-fouling
- Pilings, jetties, water gates and pipelines, submerged or buried
- ColyPotar 520
- Epoxy primer for marine coating systems
- Colypoxy 502 or Colypoxy 505
Step 1: Identify the zone
- Underwater hull: needs anti-fouling to limit marine growth. DeepSea Anti-fouling is a tin-free anti-fouling paint for underwater hulls of vessels, barges and buoys. The catalogue covers deep sea, brackish and fresh-water service.
- Submerged, semi-submerged or buried structures: need a high-build barrier. ColyPotar 520 is a two-component coal tar epoxy for steel and concrete pipelines, pilings, water gates and jetties, with resistance to fresh water, salt water, wastewater and chemicals.
Step 2: Prepare and prime correctly
Marine systems depend heavily on surface preparation and film thickness. Colypoxy 502 and Colypoxy 505 are two-component epoxy universal primers for industrial and marine settings. Immersion service with ColyPotar 520 requires the preparation and film build specified in its technical sheet.
Step 3: Know the limits
- ColyPotar 520 is not suitable for overcoating with other finishes, because it tends to bleed.
- Allow full curing before immersion or launch, as specified in the technical sheet.
- For hulls, plan the dry-dock time so preparation, coats and the launch interval all fit.
Compare products
| Product | Type | Finish | Best for |
|---|---|---|---|
| DeepSea Anti-fouling | Tin-free anti-fouling | Red brown / pink | Underwater hulls, barges, buoys |
| ColyPotar 520 | Coal tar epoxy | Matt black | Pilings, pipelines, jetties, water gates |
| Colypoxy 502 | 2K epoxy universal primer | Satin | Marine and industrial substrates |
Common mistakes to avoid
- Using a normal topside paint below the waterline.
- Applying too thin a film on immersed steel.
- Immersing before the coating has fully cured.
- Trying to paint another finish over coal tar epoxy.
Questions we often get
Is DeepSea anti-fouling suitable for fresh water?
The catalogue covers deep sea, brackish and fresh-water service. Tell us your vessel type, water conditions and operating profile so we can confirm the right system.
What coating is used for jetty piles?
ColyPotar 520 coal tar epoxy is listed for pilings, jetties, water gates and pipelines in submerged, semi-submerged or buried service. Follow the specified preparation and film build.
This guide gives general selection advice. Always follow the product’s current technical data sheet and confirm the complete system with the Coly technical team before use.