How to paint a GRP boat


	Antifouling & underwater paint


	Enamel, Varnish, Nonskid paint

Painting guide

Fiberglass boat

Aluminium boat

Wooden boat

Steel boat

Fiberglass boat
How to calculate the underwatersurface

	TOTAL SURFACE in m²
SAILING BOAT	[ (beam + draught) x load waterline] x 0.75
POWER BOAT	(beam + draught) x load waterline

Protect GRP below the waterline

	High performance polyurethane protective system	High performance epoxy protective system	Conventional system
Preparation	Sand (P150) Wash and degrease with SD	Sand (P150) Wash and degrease with SD	Sand (P150) Wash and degrease with SD
Adhesion primer	PO (16m²/l - 1 coat - Thinner DP)	PE (12m²/l - 1 coat - Thinner: DP) or HPE (8m²/l - 1 coat - Thinner: DP )	P1 (8.5m²/l -1 coat - Thinner: DP )
Filler is needed	Fair with epoxy filler WATERTIGHT	Fair with epoxy filler WATERTIGHT
Protective primer	PO 16m²/l - 2 or 3 coats - Thinner: DP	PE 12m²/l - 2 - 3 coats Thinner: DP or HPE (8m²/l - 2 or 3 coats - Thinner: DP)
Antifouling	A3 - A3T.Speed - A4 - A4T.Speed (2 coats - Thinner: DA )	A3 - A3T.Speed - A4 - A4T.Speed (2 coats - Thinner: DA)	A3 - A3T.Speed - A4 - A4T.Speed (2 coats - Thinner: DA)

Stripping antifouling

Preparation	Clean and sand the antifouling with P80 just whan the boat is our of water
Stripper	AS (3-4m²/l - 1 thick coat )
Cleaning	SD and sand with P180

Note: Nautix AS strips also one pot paints and Neutix Grip non skid.

Osmosis prevention system

	High performance polyurethane protective system	High performance epoxy protective system
Preparation	Check humidity level of the hull with a tester Sand (P150) Wash and degrease with SD	Check humidity level of the hull with a tester Sand (P150) Wash and degrease with SD
Adhesion primer	PO (16m²/l - 1 coat - Thinner: DP )	PE (12m²/l - 1 coat - Thinner: DP ) or HPE (8m²/l - 1 coat - Thinner: DP )
Filler is needed	Fair with epoxy filler WATERTIGHT	Fair with epoxy filler WATERTIGHT
Protective primer if nedeed	PO (16m²/l - 2 or 3 coats - Thinner: DP )	PE (12m²/l - 2 or 3 coats - Thinner: DP ) or HPE (8m²/l - 2 or 3 coats - Thinner: DP)
Antifouling	A3 - A3T.Speed - A4- A4T.Speed (2 coats - Thinner: DA)	A3 - A3T.Speed - A4 - A4T.Speed (2 coats - Thinner: DA)

Painting a keel

	High performance polyurethane protective system	High performance epoxy protective system
Preparation	Sandblasting or disk and prick Clean SD	Sandblasting or disk and prick Clean SD
Adhesion primer	IA (16m²/l - 1 thin coat - Thinner: DP)	P1 (8.5m²/l - 1 coat - Thinner: DP)
Protective primer	PA (14m²/l - 1 coat - Thinner: DP)
Filler is needed	Fair with epoxy filler WATERTIGHT	Fair with epoxy filler WATERTIGHT
Protective primer	PA (14m²/l - 2 ou 3 coats - Thinner: DP)	P1 (8.5m²/l - 3 coats - Thinner: DP)
Antifouling	A3 - A3T.Speed - A4 - A4T.Speed (2 coats - Thinner: DA)	A3 - A3T.Speed - A4 - A4T.Speed (2 coats - Thinner: DA)

Painting prop

	Bare bronze	Bare aluminium
Preparation	Sand (P150) Wash and degrease with SD	Sand (P150) Wash and degrease with SD
Adhesion primer	Acralu (15m²/l - 1 coat - Thinner: DP )	Acralu (15m²/l - 1 coat - Thinner: DP)
Protective primer	P7 (1/2h later: 2 coats - Thinner: DP )	PA (1/2h later: 3 coats - Thinner: DP)
Antifouling	A7T.Speed (4 coats - Thinner: DA)	A7T.Speed (4 coats - Thinner: DA)

Painting GRP above the waterline

	High performance 2 pots system	Conventional 1 pot system
Preparation	Sand (P150) Wash and degrease with SD	Sand (P150) Wash and degrease with SD
Filler is needed	WATERTIGHT Fast drying epoxy filler	WATERTIGHT Fast drying epoxy filler
Undercoat	U2 (12 m²/l - 1 or 2 coats - Thinner: DP)	U3 (14m²/l - 1 or 2 coats - Thinner: WS)
Finishing enamel	L2 (12m²/l - 2 coats - Thinner: DP)	STARLAC (14m²/l - 2 coats - Thinner: WS )

Painting a deck

	High performance 2 pots system	Conventional 1 pot system
Preparation	Sand (P150) Wash and degrease with SD	Sand (P150) Wash and degrease with SD
Filler is needed	WATERTIGHT Fast drying epoxy filler	WATERTIGHT Fast drying epoxy filler
Undercoat	U2 (12 m²/l - 1 or 2 coats - Thinner: DP)	U3 (14m²/l - 1 or 2 coats - Thinner: WS)
Finishing enamel	L2 (12m²/l - 2 coats - Thinner: DP)	STARLAC (14m²/l - 2 coats - Thinner: WS )
Non skid	Nautix grip (8m²/kg - 1 or 2 coats - Thinner: DP ) or Deck Grip (10m²/l - 1 or 2 coats - Thinner: DA)	Deck Grip (10m²/l - 1 or 2 coats - Thinner: DA)

Painting an aluminium mast or boom

	2 pots system
Preparation	Mechanical (sand) or Chemical with Scouring Acid Wash and degrease with SD eventually sand corrosion
Adhesion primer	Acralu (15m²/l - 1 coat - Thinner: DP )
Undercoat and protection	U2 (12 m²/l - 1 or 2 coats - Thinner: DP)
Finishing enamel	L2 (12m²/l - 2 coats - Thinner: DP)

Painting bilges

	High performance 2 pots system	Conventional 1 pot system
Preparation	Sand (P150) Wash and degrease with SD	Sand (P150) Wash and degrease with SD
Finishing paint	U2 white or PE grey (12 m²/l - 1 or 2 coats - Thinner: DP)	DB (10m²/l - 2 coats - Thinner: WS)

Restoring varnishes

	High performance 2 pots system	Conventional 1 pot system
Preparation	Sand (P320) and clean dusts	Sand (P320) and clean dusts
Finishing paint	VA2 (9 m²/l - Multicoating application - sand with P400 between coats - Thinner: DP)	VA3 (15m²/l - Multicoating application - sand with P400 between coats - Thinner: WS)