Steel boat questions

Conachair

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Hurrah,
Just sailed new boat (1983 Ebbtide 33') from Milford Haven round to London, time to move aboard. Couple of questions for you all knowing chaps & chapesses:
The holes in the frames on the inside of the hull seem a little high which allows a bit of water to sit trapped behind the frame (or is it call a stringer?). Now what is best course of action? Would I redrill (tricky getting a bit in that low) or put some filler or cement in to raise the level a bit? Next, rust! Not too much but it is there. I've got me chipping hammer & sand paper but what happens at the boundary with the original sound paint when repainting a small area? Do you just make sure that the existing paint is sound and paint over it a little? For primer I have tried interprotect which seems to do the job but any pointers welcome.
Third question of 2 - How do I stop my tinker tramp inflatable sounding like an elephant when I blow it up.

Many Thanks in advance.

Paddy on Conachair
 
A chairde: Stringers are horizontal-ish, frames are vertical. Steel boats shouldn't have water inside! And good design eliminates nooks and crannies where water can lie...Is it condensation? Inside should be clad (expanded polysomething, MO fire resistant) to at least 12" down below water level (but not lower). For rust in small areas: brush off flakes, dampen and apply phosphoric acid (plenty of trade names), the area will go black (good = phosphated), then paint. No foolproof method - rust is like the poor, always with us /forums/images/graemlins/frown.gif
 
Re: P.S: Put your drill away...

Cure your water ingress problem first (where's it coming from): don't drill holes - even with sticky paper, vacuum cleaner etc you'll have steel filings escape and turn to rust overnight /forums/images/graemlins/blush.gif
 
just a quick question - why should the inside be clad to at least 12" down below water level but not lower. It is the lower bit I don't understand - feel a bit thick considering I have a steel boat and feel I should know the answer!! I also know that my cladding stops about 12" below the waterline!!
 
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