A dozen of the leading antifouling paints are put to the test and rated by MBY in The Solent and the Mediterranean

Jotun Mare Nostrum SP £76.50


The SP stands for self-polishing that degrades predictably throughout the season. It’s more suitable for boats that rarely exceed 30 knots

It’s a reasonably hard wearing paint, so unless you’re a speed demon it will be suitable, however like the other Jotun paint, the top layer did come away when washed.

With no copper in the mix, the white stayed white even above the waterline, and apart from some slight yellowing from the muddy water on the East Coast, it held its colour well.

In the Solent and Mediterranean there were no barnacles and no weed growth, however at the waterline at the Solent location, the slime was thick and had some weed-like shape to it.

A consistent dissolving of paint throughout the season helped here as it performed quite well in two locations but there was some build-up of slime around the waterline on the Solent location giving slight cause for concern.

As with the other Jotun paint, a noticeable smudge of paint came off during the finger drag test, but so did all the slime. This showed that after a good blast the boat’s hull should look as good as it did when launched, so long as there is a thick enough layer of paint to last a full season.

This paint is designed to erode away, so it’s important to ensure that a sufficient thickness and/or number of coats are applied pre-season to allow this to happen. Overall it performed solidly with the added advantage of good colour fastness.

Jotun Racing SH £67.50

MBY antifouling test May 2016

This is a hard antifouling designed to withstand a strong battering when on the hull. It relies on the water’s movement to clean the slime off

Despite being a hard paint, when we did the finger test, not only did the slime come off, so did the paint. This is probably because during the season this would have worn off naturally when the boat was used.

Before launching, the Jotun SH was a slightly off-white colour, and after recovery there was barely any discolouration. Post cleaning, it was the second brightest on test.

In all three locations there were no signs of barnacles, although at the Solent location, the slime at the waterline started to look a little weedy.

We were expecting this to perform poorly due to the limited movement in the water, however in the Mediterranean and East Coast it was one of the clearest panels. In the Solent there was a moderate build-up of slime, particularly near the waterline.

Running our finger along the panel removed the slime, but also removed the top layer of paint. As explained under the durability section, this is more than likely due to the limited movement during the season. Once washed fully, the panel was extremely clean and looked ready for another season.

This is a hard paint yet in two of the three locations it fought well against the slime. The wash test showed that going out for a few trips would help keep the fouling at bay, but it is also worth noting that it can be sanded pre-season to give a smooth finish for optimum performance.

  1. 1. Introduction
  2. 2. Page 2
  3. 3. Page 3
  4. 4. Page 4
  5. 5. Page 5
  6. 6. Page 6
  7. 7. Page 7
  8. 8. Page 8
Page 5 of 8 - Show Full List