What is MARLIN METAL PRIMER and why choose it
MARLIN METAL PRIMER is a one-component adhesion primer for metals, specially formulated to be used under VELOX and VELOX PLUS antifouling paints. It ensures outstanding adhesion on stainless steel, bronze, aluminium and on epoxy protective systems or factory-finished sterndrives. With just one light coat, it prepares the surface for subsequent antifouling, helping to create a continuous, well-bonded coating system on propellers, shafts and other metal parts.
Main features
- Specific for VELOX / VELOX PLUS systems: designed as the dedicated primer to be applied before VELOX antifouling.
- Excellent adhesion on metals: formulated for stainless steel, bronze and aluminium, including aluminium with factory finish.
- Simple one-coat system: only one light coat of METAL PRIMER is required before applying VELOX PLUS.
- Suitable over epoxy and factory finishes: can be applied over appropriate epoxy coatings or existing sterndrive factory paints after proper surface preparation.
- Multiple application methods: can be applied by brush, roller, airless spray or spray gun, depending on the technical sheet version.
- Controlled film thickness: recommended maximum wet film thickness of 100 µm to obtain approximately 30–35 µm dry film.
- Fast drying: dust dry in about 20–45 minutes at 20 °C, with recoating usually possible after about 3 hours at 20 °C.
- Green colour: helps visually confirm coverage during application.
- Long shelf-life: up to 48 months when stored correctly.
Technical specifications
- Product type: Adhesion primer for metals, one component.
- Intended system: Primer for VELOX and VELOX PLUS antifouling.
- Substrates: Bronze, steel, stainless steel, aluminium (including factory finish), epoxy protective systems, sterndrive factory paints.
- Colour: Green.
- Volume solids: 35–40 %.
- Specific gravity: approximately 1.25–1.30.
- VOC content: approximately 550–600 g/l.
- Mixing ratio: One component (ready to use; no hardener).
- Recommended thinner: Thinner N. 4 (for spray application only, if required).
- Application methods: Brush, roller, airless spray or spray gun.
- Recommended wet film thickness: up to 100 µm.
- Approximate dry film thickness: about 30–35 µm.
- Theoretical coverage: about 10–11 m²/l per coat at 90–100 µm wet film.
- Packaging sizes: 0.25 l, 0.5 l, 2.5 l.
- Shelf-life: about 48 months (storage temperature between 10 °C and 40 °C, protected from excessive humidity and direct sunlight).
- Drying times at 20 °C (approximate):
- Dust dry: about 20–30 minutes.
- Touch dry: about 1–2 hours.
- Recoating with VELOX PLUS: about 3 hours (when conditions allow, longer intervals are advisable for better in-depth drying).
- Launching: minimum about 12 hours; in one sheet the maximum interval before launching is indicated as about 4 months.
Applications and use cases
Typical substrates
- Bronze propellers and underwater metal parts after complete removal of previous coatings and thorough sanding.
- Steel or stainless steel components such as shafts or other underwater fittings.
- Aluminium components:
- Bare aluminium, preferably protected beforehand with an appropriate epoxy coating.
- Aluminium with factory finish (for example new sterndrives), after light sanding.
- Existing epoxy protective systems after light sanding with fine abrasive media.
Surface preparation (summary)
- Remove existing coatings where required: eliminate old antifouling or other coatings with dry sandpaper (grit 80), manually or with a dual action rotary sander using a soft pad to avoid damaging the propeller. Old VELOX PLUS from the previous season should not be removed where indicated in the technical recommendations.
- Sand the metal thoroughly: use dry sandpaper grit 80 and renew it often. The surface must be very rough after sanding. Do not use coarser or finer grit, worn-out sandpaper or scouring pads such as Scotch Brite. Sandblasting is not recommended unless done by an experienced professional.
- Clean and degrease: wash and degrease all metallic surfaces with SOLVENT 102 ANTISILICONE or pure acetone and a clean rag. Change rags frequently, especially for new or folding propellers, which may carry more grease.
- Avoid unsuitable cleaners: do not use acids, other solvents than recommended, water, detergents or soaps; these can compromise adhesion.
- For epoxy or factory-finished surfaces: lightly sand with an abrasive pad or fine sandpaper (grit 180–220), then clean and apply METAL PRIMER.
Primer and antifouling application
- Apply METAL PRIMER: apply one light coat with a small or medium brush (or by spray where allowed), keeping the wet film thickness within about 100 µm. Thicker coats than recommended may reduce adhesion. Allow to dry for at least about 3 hours at 20 °C.
- Apply VELOX PLUS antifouling:
- First coat: apply one coat of VELOX PLUS (about 100 µm wet, 35 µm dry) with long, continuous brush strokes. Avoid working repeatedly over the same area, as this may excessively soften METAL PRIMER. Full colour coverage is not expected after the first VELOX PLUS coat; some green primer may still show.
- Second coat: after at least about 3 hours at 20 °C, apply a second VELOX PLUS coat (about 100 µm wet, 35 µm dry) with long strokes perpendicular to the first coat. A third coat can be applied where higher coverage is desired or where fouling growth is particularly aggressive.
FAQ
How many coats of MARLIN METAL PRIMER are required?
Only one light coat of METAL PRIMER is recommended, with a maximum wet film thickness of about 100 µm.
On which metals can METAL PRIMER be used?
It is designed for bronze, steel, stainless steel and aluminium, including aluminium with factory finish, as well as suitable epoxy coatings and sterndrive factory paints after correct surface preparation.
Can I apply VELOX PLUS directly on bare metal without METAL PRIMER?
No. VELOX PLUS should not be applied on bare metal without METAL PRIMER. The primer is essential to achieve proper adhesion.
Which solvents are recommended for cleaning the surface before priming?
The technical documentation specifies SOLVENT 102 ANTISILICONE or pure acetone together with clean rags. Other acids, solvents, water, detergents or soaps should not be used.
Should I sand between coats?
Metal surfaces must be thoroughly sanded before METAL PRIMER application (typically grit 80, or 180–220 on factory finishes or epoxy). Between METAL PRIMER and VELOX PLUS coats, sanding is not indicated; sufficient drying time and correct film thickness are emphasised instead.
Can I dilute METAL PRIMER?
For brush application, the product should not be diluted. For spraying, dilution is allowed only with THINNER N. 4, according to the instructions.
How long can I wait before launching after application?
Technical data indicate a minimum of about 12 hours at 20 °C before launching, with a maximum interval of about 4 months in one of the sheets.
What happens if I touch the cleaned surface with bare hands?
The documentation warns that touching prepared metal with bare hands can leave grease or dirt, which dramatically reduces adhesion and can cause coating detachment.
Can METAL PRIMER be applied over other antifoulings or one-component primers?
No. It should not be applied on other antifouling products or on other one-component primers.
Section 14 – Transport information
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Section 8 – Individual protection measures
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