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I might struggle to get the angle to weld the top of the hole from the inside, at least without taking out more of the floor. As it's under the waterline, would it look awful if I cut the holes in the new plate? Heating system, loo and kitchen all removed :(, trying not to find screws in the...

One more question- I'm guessing I can't use dye penetrant as I can't access the back of the weld. Is there any other means to check watertightness?

Thanks. I was planning to back step weld or just jump around all over to keep the heat down. I'm pretty slow so it'll have plenty of time to cool ;) I was going to cut two slots in the middle of each plate to weld to the original. Any size and shape recommended? I will take pics of the better...

Hi Barry. I sent the datasheet for the holding primer to the paint supplier and they said Jotamastic will be fine directly over it. It's sprayed on as a very thin coat and dried by the same machine after shot blasting apparently.

Thanks for the tip re vinegar, the way I paint, that will come in very useful :D Re the Tercoo, I'm actually using the Perago versions. They look identical (blue rather than brown) but I could get a seven disk multi version that would fit a M14 polisher spindle. They are good but very slow...

Hi Nick, thanks for the quick reply. Yes, pitting is below or on waterline, sporadic from just above the baseplate up to the first rubbing strake. They range from shallow to 2.9mm. Plenty of 'high twos' so the steel is down to just over 2mm in places. One was below two. There's no insurance...

I'm not sure if i should start a new post for this or resurrect an old one? Apologies if I got it wrong. It turns out welding fittings on was a minor detail of the work required :( The boat (55' narrowboat) was slipped and I began the horrendously slow process of taking it back to bare steel...

Thanks Nick. Fortunately they line up with a slanted interior panel under the side deck, so i should have at least a foot clear once i've removed the old wiring. I will have a mate with an extinguisher on hand and keep an eye on them for a few hours afterwards. I'm a big fan of Jotun paints and...

Thank you both, much appreciated!

Ps. I will stick weld (no Mig welder yet)

Hi. Please forgive what might be a dumb question and any lack of forum etiquette from my ignorance/inexperience. I would like to weld a number of steel rings (fixed on 5mm plate) to a narrowboat hull (6mm thick). It will be above the waterline (freshwater and brackish) but liable to regular...