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 well and 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 nameCoating interval
at 10°C min/max
Thinner/
Cleaner
Abrasive
Paper
Comments
3-4SEAJET 117 or 118
Epoxy Primer
18hrs/3 daysThinner ENone Thin 1st
coat by 10%
Or for touch up areas only


3-4SEAJET 011
Underwater Primer
4hrs/7 daysThinner ANone
Then


1-2SEAJET Antifouling8 hrs/NoneThinner ANone
When using SEAJET 118, apply a thin coat of SEAJET 011 before applying the antifouling.
Leave 18 hours before launching. Maximum interval before launching is 6 months.

Above the waterline

Pre-treatment:
Degrease well and 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 nameCoating interval
at 10°C min/max
Thinner/
Cleaner
Abrasive
Paper
Comments
1SEAJET Universal
Primer Undercoat
24 hrs/14 daysThinner U320 dryUse this primer
when an
undercoat is
required
Then




2–3SEAJET Brilliance
Topcoat
24 hrs/NoneThinner U400 wet or
finer





Or two component, high performance finish over bare steel


1SEAJET 117
Multipurpose
Epoxy
18 hrs/7 daysThinner E320 dryUse this primer
when an
undercoat is
required

Then

 


2–3SEAJET 132
Polyurethane
Topcoat
12 hrs/NoneThinner P400 wet or
finer