How many coats of antifouling are needed?

Coat number must not be set solely by the categories self-polishing, hard or biocide-free. Product, required service life, substrate and technical data sheet are decisive.

Seajet antifouling examples

• Seajet 031 Samurai: 2 to 3 coats at the start of the season.
• Seajet 033 Shogun: 2 to 3 coats; multi-season protection may be possible depending on area and use.
• Seajet 034 Emperor A: 3 coats for potential protection of up to two seasons.
• Seajet 037 Coastal: 2 coats at the start of the season.

Requirements can differ for a maintenance coat on a sound, compatible existing coating. Extra coats do not replace proper surface preparation.

Biocide-free systems have their own build-ups

• Seajet 021 EKO: 2 coats per season.
• Seajet 2300 Hard Coating: 2 coats, plus a suitable primer system on bare substrates.
• Bioclean Eco: 2 coats of coloured Tie Coat plus 2 coats of transparent Clear Coat.

Tie Coat and Clear Coat are one Bioclean system, so the quantity of each product is calculated separately for two coats.

Primer is a separate calculation

Primers provide adhesion, barrier, corrosion or osmosis protection depending on the product. Seajet 015 can act as an adhesion or barrier coat. Seajet 117 Epoxy Primer requires several coats for a closed underwater barrier. The configurator uses four coats for a complete bare-hull rebuild; other functions follow the data sheet.

How to calculate litres

Required litres = underwater area × coat number ÷ theoretical coverage. The result is then rounded up to available pack sizes. Substrate, tools and hull shape cause application losses, so the result is a planning aid.

The quantity calculator estimates area. The configurator selects product, primer, coat number and pack combination. Also check the compatibility table.