Steel
Steel corrodes when exposed to salt and water and for long term performance, it essential to prepare the surfaces well. Abrasive grit blasting or water blasting is recommended to a white metal finish (blast standard Sa2½). Mechanical abrasive discs can be used, but be careful not to polish the surface or adhesion may be affected. Use angle grinders to smooth welds or round sharp edges. Enough primer must be applied to protect the steel against water. So apply all the recommended coats to avoid areas of low film thickness, which will lead to premature breakdown. We recommend a minimum dry film thickness of 225µ (microns or micrometers) of primer for long term protection.
Below the waterline
Pre-treatment:
Degrease using SEAJET BOATWASH. Rinse with fresh water.
Abrasive grit blasting to a white metal finish.
Brush off dust and use lint free tack rags to remove remaining traces of dust.
| No. of Coats | Product name | Coating interval at 10°C min/max | Thinner/ Cleaner | Abrasive Paper | Comments |
 | |||||
| 4 | SEAJET 117 or 118 Epoxy Primer | 18hrs/3 days | Thinner E | None | Thin 1st coat by 10% |
| Or for touch up areas only | |||||
| 5 | SEAJET 011 Underwater Primer | 4hrs/7 days | Thinner A | None | |
| Then | |||||
| 1-2 | SEAJET Anti-fouling | 8 hrs/None | Thinner A | None | |
| | | | | |
| When using SEAJET 118, apply a thin coat of SEAJET 011 before applying the anti-fouling. | |||||
| Leave 18 hours before launching. Maximum interval before launching is 6 months. | |||||
Above the waterline
Pre-treatment:
Degrease using SEAJET BOATWASH. Rinse with fresh water.
Abrasive grit blasting to a white metal finish.
Brush off dust and use lint free tack rags to remove remaining traces of dust.
| No. of Coats | Product name | Coating interval at 10°C min/max | Thinner/ Cleaner | Abrasive Paper | Comments |
| 1 | SEAJET Universal Primer Undercoat | 24 hrs/14 days | Thinner U | 320 dry | Use this primer when an undercoat is required |
| Then | |||||
| 2–3 | SEAJET Brilliance Topcoat | 24 hrs/None | Thinner U | 400 wet or finer | |
Or two component, high performance finish over bare steel | |||||
| 1 | SEAJET 117 Multipurpose Epoxy | 18 hrs/7 days | Thinner E | 320 dry | Use this primer when an undercoat is required |
Then
| |||||
| 2–3 | SEAJET 132 Polyurethane Topcoat | 12 hrs/None | Thinner P | 400 wet or finer | |
| |||||