Bottom Primer Hanse 2006-2007

Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic

   My Hanse 400 needs to be refurbished below waterline. There is light osmosis indications 10-30 cm below waterline (1 mm diameter bulges, no liquid inside). And lot of old antifouling paint. Does somebody have knowledge about the primers used by Hanse maker in the early years of 400 series? If old  the primer is 1-component, it needs to be removed before painting with 2-component epoxy primer. But if it would be originally 2-component primer, sanding and cleaning of the old primer surface would be sufficient before new epoxy layers?

Author	Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic
Captain Pasi Members Profile Send Private Message Find Members Posts Add to Buddy List Sub Lieutenant Joined: 20 October 2025 Location: Naantali FIN Status: Offline Points: 4	Post Options Post Reply Quote Captain Pasi Report Post Thanks(0) Quote Reply Topic: Bottom Primer Hanse 2006-2007 Posted: 20 October 2025 at 12:20
	My Hanse 400 needs to be refurbished below waterline. There is light osmosis indications 10-30 cm below waterline (1 mm diameter bulges, no liquid inside). And lot of old antifouling paint. Does somebody have knowledge about the primers used by Hanse maker in the early years of 400 series? If old the primer is 1-component, it needs to be removed before painting with 2-component epoxy primer. But if it would be originally 2-component primer, sanding and cleaning of the old primer surface would be sufficient before new epoxy layers?

WEmmens Members Profile Send Private Message Find Members Posts Add to Buddy List Lieutenant Joined: 18 August 2013 Location: NL Status: Offline Points: 46	Post Options Post Reply Quote WEmmens Report Post Thanks(0) Quote Reply Posted: 20 October 2025 at 19:02
	In the NL the new Hanses delivered bij the local dealer did as a standard not have any primer/antifouling applied by Hanse Yachts. This was an item in the options list and the dealer could provide it. I've removed all layers of antifouling and primers myself after seven years which was an activity you don't want to do to often. By the way are you sure it is osmosis? I did have osmosis in my rudder two years after delivery but so far the hull is sound. Regards, Wilko Edited by WEmmens - 20 October 2025 at 19:06
	Hanse 400, Mona Lisa, #337, 2007, Yanmar 3JH4E, Flexofold 3bl.

Captain Pasi Members Profile Send Private Message Find Members Posts Add to Buddy List Sub Lieutenant Joined: 20 October 2025 Location: Naantali FIN Status: Offline Points: 4	Post Options Post Reply Quote Captain Pasi Report Post Thanks(0) Quote Reply Posted: 20 October 2025 at 21:36
	There is small and flat "pimples" surrounding the boat 10-30 cm below the waterline. Antifouling paint chips around the pimple by itself, but old grey primer is solid. This phenomenon is not severe, but may be of same kind of chemical process like osmosis. All primers do not stop water entering in the hull material. Manually removing antifouling is a hard job, primer is at least double hard. Maybe there is no options but scraping both paints

Captain Cook Members Profile Send Private Message Find Members Posts Add to Buddy List Admiral Joined: 23 May 2006 Location: Denmark Status: Offline Points: 1245	Post Options Post Reply Quote Captain Cook Report Post Thanks(0) Quote Reply Posted: 20 October 2025 at 22:03
	My H400 /2006 was delivered with Hempel 2-comp Light Primer and Hempel Mille self-polishing antifouling. No osmosis. Mille was a magnet for barnacles, so I sanded it off and added an extra layer of Light Primer and Hempel Hard Racing antifouling. Every second year I renew the antifouling where I add 100g chili-powder (soaked in thinner) to every liter of Hard Racing (or equivalent hard anti-fouling). The amount of barnacles on the bottom can be counted with the help of fingers and toes. I suppose that the combination of copper and chili are responsible for the magic, because on my saildrive there still has to be cleaned off a lot of barnacles every year even when I have added chili to the paint. My normal practice is to clean the bottom with high-pressure cleaner, and clean the waterline with Hardol/Metal Polish, and then polish the freeboard. If necessary I dab with antifouling a few places, but I only use the 7½ liters of Hard Racing every second year. The saildrive and bow propeller needs antifouling every year. I have found a picture where Freya is just lifted out of the water - count the barnacles! Edited by Captain Cook - 20 October 2025 at 22:24
	Freya H400 #27 (2006),2-cabin, 40HP 3JH4E, 3-blade Flexofold, Aries LiftUp Windvane, Exturn 300, Jefa DD1,Simrad NX40,Icom M603(VHF)+M802(SSB)

Captain Pasi Members Profile Send Private Message Find Members Posts Add to Buddy List Sub Lieutenant Joined: 20 October 2025 Location: Naantali FIN Status: Offline Points: 4	Post Options Post Reply Quote Captain Pasi Report Post Thanks(0) Quote Reply Posted: 04 November 2025 at 09:04
	I have ordered sand-blasting with glass grains. After that 6 layers of Hempel or International 2 k epoxy primer to prevent osmosis. Also any other proven 2K primer would go

Ratbasher Members Profile Send Private Message Find Members Posts Add to Buddy List Vice Admiral Joined: 31 May 2017 Location: Cyprus Status: Offline Points: 818	Post Options Post Reply Quote Ratbasher Report Post Thanks(0) Quote Reply Posted: 04 November 2025 at 13:01
	Under the scrutiny of a surveyor advising on an extensive refit I had mine soda-blasted and then epoxied before applying Micron 350 three seasons ago. No signs of osmosis; just preventative as the boat spends 10 months afloat. As an aside, I don't think there's any 'best' antifoul, just what's known to work best in your particular area.
	H400 (2008) 'Wight Leopard' Gosport, UK



Welcome to myHanse.com the forum for Hanse Yachts owners throughout the world.