Fibreglass and osmosis prevention

See "Antifouling your boat", "Painting and Varnishing above the Waterline" for surface preparation and application advice.

Below the waterline

Pre-treatment:
Degrease surface. Rinse with fresh water.
Key the surface and flatten back with P120-P180 abrasive paper.
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 117
Epoxy Primer
18hrs/3 daysThinner ENone
Or




1SEAJET 011
Underwater
Primer
4hrs/7 daysThinner ANone
Then




1-2Seajet
Antifouling
8 hrs/NoneThinner ANone

Leave 18 hours before launching


Protection Against Osmosis
 




3-4SEAJET 117
Epoxy Primer

or

18hrs/72 hrs

Thinner ENone


2

Then

2


SEAJET 118
Epoxy Primer

Seajet

Antifouling


32hrs/72hrs



Thinner E


None


When using SEAJET 118, apply a thin coat of SEAJET 117 before applying the anti-fouling.
Leave 18 hours before launching. Maximum interval before launching is 6 months.


Above the waterline

Pre-treatment:
Degrease surface. Rinse with fresh water.
Flatten back with P180–P280 abrasive paper.
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 012 Universal
Primer Undercoat
24 hrs/14 daysThinner U320 dryUse this primer
when an
undercoat is
required
Then




2–3SEAJET 122 Brilliance
Topcoat
24 hrs/NoneThinner U400 wet or finer

Or two component, high performance finish over bare fibre-glass


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