Below Waterline Hull Work - Cracks & Barrier Coat

Apr 22, 2025
18
Morgan 321 Oswego
As I continue on my thru-hull and electrical journey and waiting for parts, I'd thought I'd start sanding the old, detritus-covered bottom paint and inspecting the crack I could see in the rudder paint and plan my next course of action. I have a Morgan 32 with an encapsulated keel and a skeg-mounted rudder. The boat will be located in Lake Ontario (fresh water with zebra mussels) and is hauled every winter. The PO said he re-did the bottom paint a couple times over the 9 years he's owned it and right now, even though most of it looks in decent shape, there is quite a bit of a buildup of scale, dirt, etc that isn't responding well to a brush and water. There was also a crack in the antifouling paint on the side of the rudder that I wanted to inspect a little closer. Yesterday I started sanding the rudder.

My first question is the "shoe" on the bottom of the skeg. Once I got most of the bottom paint off, I saw what appears to be a bronze shoe on the bottom of the skeg horn extending out for the pintle. I expected some beefy bolting somewhere but I cannot see any attachment hardware yet on either side. How are these usually affixed to the skeg? Maybe I need to get to bare metal all around. Here's a some pictures of the starboard side and the bottom.

Skeg Shoe - side.jpg

Skeg Shoe - bottom.jpg


With the bottom paint off, I was able to see the extent of the "small crack" I could see with the paint on.

On the port side of the rudder, the small crack turned into 3 cracks about 1/16" wide but shallow. What I was surprised to find is a slightly larger and deeper crack on the leading edge of the rudder. They look like there is water seeping but in actuality they are all dry -- it's just the amount of sanding and remaining paint dust once I got them cleaned up enough. Lastly, there are several spots where the gelcoat appears to be gone. I can see resin but no fibers in any of the spots. I don't know if it was me being too aggressive with sanding or if it was just painted over that way.

Rudder port side cracks.jpg

Rudder leading edge crack.jpg


My plan is to gouge out the cracks a little bigger and fill with thickened epoxy and get it as fair as possible. Then 4-5 coats of Interprotect barrier coat with 2 coats of VC17m antifouling paint.

I am thinking of drilling a couple small holes hear the bottom of the rudder to see if water does drip out however I haven't found any damp areas yet, despite it being a wet spring and several good thunderstorms over the last couple weeks. The rudder sounds consistently solid if I tap it with a small plastic mallet.

There is no way I am dropping the rudder this season and getting into that this year. I'd like to drop it next year to replace any bearings or bushings, clean up the pivot points, repack the rudder stuffing box, pull the shaft and replace the shaft log, and any other issues that arise with that.

Do you think my repairs would be satisfactory for now? Are there any other things I should/could do or look at?
 
Jan 11, 2014
12,955
Sabre 362 113 Fair Haven, NY
The leading edge crack is probably fairing compound from when the 2 halves were joined. The other cracks look like cracked fairing compound, but hard to tell from the photos. I'll try to take a look this weekend.
 
Jan 11, 2014
12,955
Sabre 362 113 Fair Haven, NY
Took a look at the rudder and hull this morning. Overall, for the rest of the season I wouldn't be concerned. The cracks on the side are well adhered, meaning they don't look like they will expand or have the fairing chip off. The small open crack on the leading edge should be opened up a bit, to maybe an ⅛" or so and filled with thickened epoxy. The opening should be a V. Old school can openers, the kind we used to call church keys would work to open that up. You mentioned that next year you intend to drop the rudder, that would be the time to properly repair all this.

The hull has been painted with VC Tar. Back in the 80s this was used as a barrier coat. Over time it tends to dry out and sometime crack and fall off depending on how thick it was applied. I wouldn't do anything with it this season, which is getting shorter. Nor would I bottom paint the hull. The paint would just be one more thing to sand off next spring. I would put a coat of cheap ablative antifouling paint on the bare gelcoat, to keep the algae from getting too well attached to the hull. Power washing on haul out will clean that right up.