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Paint Systems

,Paint Systems / Painting Fibreglass / Painting Metal / Painting Ferro Cement / Painting wood

 

There are 2 main Paint systems available to use . A single pack system and a 2 pack system. There are a few factors to consider when choosing the system that is right for you.

 

Single pack

2 pack
Protection Good Excellent

Usage

Easy to apply. Use on substrates

where movement is possible.

ie. timber planked boats (clinker/Carvel)

Bit harder to apply, some experience needed.

Consideration to temperature and overcoating

times required. Use where movement of

substrate is minimal. ie Steel/Fibreglass/GRP/

GOP/ Ferro/ Aluminium etc.

 

Compatibility and

Overcoating

Single pack paints can only be overcoated

with single pack paints unless a suitable tie

coat has been applied.

Two pack paints can be overcoated with either

single pack paints or two pack paints.

Durability

Good. But not as durable as a two pack

system.

A lot more durable and hardwearing than single

pack paints. Generally would last more than

twice as long single pack sytems

Generally I would always recommend using a 2 pack system where possible as it is a lot more hard wearing and durable coating. The only instance where a single pack system is specified is for a timber planked boat where you need the flexibility of the single pack paints. 2 Packpaints are too brittle for this application

Painting Fibreglass

Fibreglass , Glass over ply(GOP) and Glass reinforced Plastic (GRP)  are all very similar substrates. All use a glass fibre or cloth with a binding agent ie epoxy or polyester resin. With Fibreglass and GOP you are coating the bare surface with GRP boats they are formed in a mould and have a surface layer of gelcoat. This gelcoat layer provides a very hard weraing virtually maintenance free surface. New gelcoat contains large residues of wax and mould-release agents that must be removed before painting. Use detergents and Degreaser to remove mould release agents used in the construction of the vessel. Abrade the surface (150-180 grade paper). Remove dust.

Repainting glassfibre

Over time gelcoat becomes old and weathered. This will cause the cosmetic appearance to deteriorate, and eventually it will need painting to protect the surface.  Generally the deck and coach roof will deteriorate sooner than the topsides.The extent of the degradation depends on many factors:

• colour and pigment of the gelcoat,

• if the gelcoat has been maintained,

• condition of where the vessel is kept e.g. strong UV light,

• mechanical damage,

• weathering, etc.

Old gelcoat will probabily still bear residues of wax and mould-release agents and it will be necessary to carry out a degreasing procedure.

 

Product                No. of coats

Recoating Interval

10 deg C / 20deg C

     Covers

Thickness per coat

Wet / Dry

Thinners
Fibreglass - Single Pack System

 

Above the Waterline

1.Uni Primer 1314 * 1 8hrs-60d / 4hrs-30d 8.5 sqm/L 120 / 50  808
2.Primer/undercoat 1320 1or2 8hrs60d / 4 hrs-30d 12 sqm/L 75 / 40 823
3.Enamel topcoat 5214 2 or more 48hrs-6d / 24hrs-3d 14 sqm/L 75 / 30 823

 

* Uni primer is a high performance single pack primer giving great protection of substrate. This coat is optional for fibreglass and not necessary for GRP

 

Below the waterline

1. Underwater primer 4633 1-2 16hrs- / 8hrs- 5.3sqm/L 175 / 80    808
2. Antifouling 2-3 9hrs- / 5hrs- 12sqm/L 75 / 40 808
Product                No. of coats

Recoating Interval

10 deg C / 20deg C

     Covers

Thickness per coat

Wet / Dry

Thinners

 

 

Fibreglass - Two Pack System

 

Above The waterline

1.light Primer 4555 8hrs-60d / 4hrs-30d 5.2 sqm/L 200 / 100  845
2.Hempathane 5510 2 24hrs-60d / 12 hrs-30d 14 sqm/L 75 / 35 808

 

Below the waterline

1.Quattro Primer 17634 * 1 4hrs-60d / 2hrs-30d 5.8 sqm/L 175 /125   845
2.Light Primer 4555 1or2 8hrs60d / 4 hrs-30d 12 sqm/L 200 / 100 845
3. Antifouling 2 or more 9hrs-6d / 5 hrs-3d 12 sqm/L 75 / 40 808

 

* Hempel Quattro primer is a very hard high build primer which gives great protection of the substrate and is not easily sandable. Optional for fibreglass and not necessary for GRP. Is also used for osmosis protection. see Osmosis section

*Any Fairing required can be applied after this coat

Overcoating.  If recoating times are exceeded the surface needs to be abraded before application of subsequent coat.

Painting Metal

     Painting Steel

In the marine environment, metal hulls need painting to ensure resistance to corrosion and for a cosmetic finish.With the correct surface preparation and paint system, steel and aluminium hulls will give long periods of service with minimal maintenance.

It’s essential that the paint system completely isolates the metal surface from air and water.Metal plates are often pre-primed with a protective shop primer. This isn’t intended to be part of the coating system, and ideally should be removed before starting the coating.Before working on metal, it must be free of corrosion. Remove salt and contamination by high pressure  (min 2500 psi) freshwater washing.Grit blast steel to Sa2.5 (Swedish Visual Standard, ie near white metal), or abrade. Grit blast aluminium with non-metal abrasives, or abrade with 60-120 grade paper to bright metal.Prime bare metal with Light Primer, thinned 20%, straight after surface preparation to avoid contamination  and surface deterioration before coating, and to obtain maximum adhesion to the surface.Check surface temperature before coating, as metal surfaces can vary greatly from the ambient temperature.

 

Painting Aluminium

Aluminium Is a little harder to paint as the surface quickly develops an oxide layer which paint has trouble adhering to. This oxide layer needs to be removed before application of any paint.

There are 2 ways to go about this:

1.You can either shot blast to sa.2.5 specs with non metallic particles then immediately apply first coat of Light Primer thinned 20%

2. You can abrade the aluminium with 60-120 grit paper, remove dust, Acid wash with poshphoric acid. Fresh water clean, let dry and immediately apply zinc chromate primer as first coat then Light primer thinned 20%

 

 

Product                     No. of coats

Recoating Interval

10 deg C / 20deg C

     Covers

Thickness per coat

Wet / Dry

Thinners
Metal - Single Pack System

 

Above the Waterline

1.Uni Primer 1314 * 1 8hrs-60d / 4hrs-30d 8.5 sqm/L 120 / 50  808
2.Primer/undercoat 1320 2-4 8hrs60d / 4 hrs-30d 12 sqm/L 75 / 40 823
3.Enamel topcoat 5214 2 or more 48hrs-6d / 24hrs-3d 14 sqm/L 75 / 30 823

* Uni Primer is a hardwearing single pack primer giving great protection.  Any fairing required can be applied after this coat

 

Below the waterline

1. Underwater primer 4633 5-7 16hrs- / 8hrs- 5.3sqm/L 175 / 80    808
2. Antifouling 2-3 9hrs- / 5hrs- 12sqm/L 75 / 40 808
Product                  No. of coats

Recoating Interval

10 deg C / 20deg C

     Covers

Thickness per coat

Wet / Dry

Thinners

 

Metal - Two Pack System

 

Above The waterline

1.Quattro Primer 17634 * 1 4hrs-60d / 2hrs-30d 5.8 sqm/L 175 /125   845
2.Light Primer 45551 2-4 8hrs60d / 4 hrs-30d 5 sqm/L 200 / 100 845
3.Hempathane 55100 2 or more 24hrs-60d / 12 hrs-30d 14 sqm/L 75 / 35 808

* Hempel Quattro primer is a very hard high build primer which gives great protection of the substrate and is not easily sandable. Any Fairing required can be applied after this coat.

 

Below the waterline

1.Quattro Primer 17634 * 1 4hrs-60d / 2hrs-30d 5.8 sqm/L 175 /125   845
2.Light Primer 45551 5-7 8hrs60d / 4 hrs-30d 5 sqm/L 200 / 100 845
3. Antifouling 2 or more 9hrs-6d / 5 hrs-3d 12 sqm/L 75 / 40 808

 

* Hempel Quattro primer is a very hard high build primer which gives great protection of the substrate and is not easily sandable. Any Fairing required can be applied after this coat. Is also used for osmosis protection. see Osmosis section

*Overcoating.  If recoating times are exceeded the surface needs to be abraded before application of subsequent coat

* Painting metal it is important to get enough protection on the surface, Basically the more coats of primer the better protection. If spraying you can keep going around the boat wet on wet to build up the required film thickness of at least 300microns DFT.

 

 

Painting Ferro Cement

Ferrocement is a specialised form of reinforced concrete in which a matrix of steel rods and fine mesh is covered in a high quality mortar to produce a material of tensile strength and flexibility. It is a relatively inexpensive boat building material with the advantage of being fire resistant, durable and easy to repair. However, it is heavier and highly skilled plasterers and painters are needed to produce a finish comparable with other boat building materials. It is recommended to use a two pack painting system on ferrocement.

Particular tips for painting ferrocement

Ensure new ferrocement is fully cured.Stone down the ferrocement with a hand-held medium grit carborundum stone lubricated with fresh water or wet abrade with 120 grade wet or dry abrasive paper.Alternatively, wet or dry abrasive blast the hull to get a slightly roughened and firm surface, free of scum layer and contamination.Any loose wires or tie-ends exposed during this process should be punched below the substrate and filled.Acid wash the surface using 5% w/w (approx) nitric acid or phoshoric acid solution. Leave for 2 - 4 minutes then rinse off with fresh water.Check the pH reading of the surface of the substrate is between 6.5 and 8.0 and when scraped with a sharp knife, a clean scratch is left.Allow the surface to dry naturally.

Product                  No. of coats

Recoating Interval

10 deg C / 20deg C

     Covers

Thickness per coat

Wet / Dry

Thinners

 

Ferro Cement 2 Pack System only

 

Above The waterline

1.Epoxy Sealer 0599 1   16hrs- / 8hrs- n/a 120 / -    845
2. Light Primer 45551 2-4 8hrs60d / 4 hrs-30d 5 sqm/L 200 / 100 845
3. Hempathane 55100 2 24hrs-60d / 12 hrs-30d 12 sqm/L 75 / 35 808
3.Enamel topcoat 5214* 2 or more 48hrs-6d / 24hrs-3d 14 sqm/L 75 / 30 823

* Optional Single pack topcoat. Can use single pack topcoat instead of a two pack if desired but not recommended.

 

Below the waterline

1.Epoxy Sealer 0599 1   16hrs- / 8hrs- n/a 120 / -    845
2..Quattro Primer 17634 * 1 4hrs-60d / 2hrs-30d 5.8 sqm/L 200 / 100 845
3. Light Primer 45551 5-7 8hrs60d / 4 hrs-30d 5.2 sqm/L 200 / 100 845
4. Antifouling 2 or more 9hrs-6d / 5 hrs-3d 12 sqm/L 75 / 40 808

 

* Hempel Quattro primer is a very hard high build primer which gives great protection of the substrate and is not easily sandable. Any Fairing required can be applied after this coat. Is also used for osmosis protection. see Osmosis section

*Overcoating.  If recoating times are exceeded the surface needs to be abraded before application of subsequent coat

 

 

Painting Wood

Wood has been used as a boat building construction material for a long time - starting with the simplest dugout canoe and evolving to the high-tech race boats of today.

Wood is a naturally occurring organic material which can suffer from several problems in the marine environment. Being biodegradable, wood offers a food source to various organisms from rot inducing fungi to boring worms and crustacea which can reduce planking to a crumbling honeycomb. Wood is also capable of absorbing quite large quantities of water, resulting in movement which may prove detrimental to the adhesion of coating systems. This expansion may be used to advantage by some construction methods to close the gap between timbers.
A wooden boat will need protection against the above. By correct surface preparation and the use of an appropriate coating system these problems can be overcome and the natural beauty of wood enhanced.
Both paint and varnish finishes are available in single pack and two pack systems for wood protective coatings.

 

 

 

Product                No. of coats

Recoating Interval

10 deg C / 20deg C

     Covers

Thickness per coat

Wet / Dry

Thinners
Wood - Single Pack System

 

Above the Waterline

1. Uni Primer thinned 20% 1 8hrs-60d / 4hrs-30d 8.5 sqm/L n/a 808
2.Uni Primer 1314 1 8hrs-60d / 4hrs-30d 8.5 sqm/L 120 / 50  808
3.Primer/undercoat 1320 1or2 8hrs60d / 4 hrs-30d 12 sqm/L 75 / 40 823
4.Enamel topcoat 5214 2 or more 48hrs-6d / 24hrs-3d 14 sqm/L 75 / 30 823

 

 

 

Below the waterline

1. Underwater primer thinned 20% 1 16hrs- / 8hrs- 5.3sqm/L n/a 808
1. Underwater primer 4633 2 0r more 16hrs- / 8hrs-  5.3sqm/L 175 / 80        808
2. Antifouling 2-3 9hrs- / 5hrs- 12sqm/L 75 / 40 808
Product                No. of coats

Recoating Interval

10 deg C / 20deg C

     Covers

Thickness per coat

Wet / Dry

Thinners

 

 

Wood/ Plywood - Two Pack System

 

Above The waterline

1. Light Primer Thinned 20% 1 8hrs-60d / 4hrs-30d 5.2 sqm/L n/a 845
1.light Primer 4555 8hrs-60d / 4hrs-30d 5.2 sqm/L 200 / 100  845
2.Hempathane 5510 2 24hrs-60d / 12 hrs-30d 14 sqm/L 75 / 35 808

 

Below the waterline

1. Light Primer Thinned 20% 1 8hrs60d / 4 hrs-30d 5.2 sqm/L n/a 845
2.Quattro Primer 17634 * 1 4hrs-60d / 2hrs-30d 5.8 sqm/L 175 /125   845
2.Light Primer 4555 1or2 8hrs60d / 4 hrs-30d 5.2 sqm/L 200 / 100 845
3. Antifouling 2 or more 9hrs-6d / 5 hrs-3d 12 sqm/L 75 / 40 808

* Optional -Hempel Quattro primer is a very hard high build primer which gives great protection of the substrate and is not easily sandable. Any Fairing required can be applied after this coat. Is also used for osmosis protection. see Osmosis section

 

 

 

 

 

 

 

 

 

 

 

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