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Interior teak goes 'dark as a cave' because it wasnt originally varnished but oiled. Its the oil that has turned to black due oxidation; but, that oxidation probably has now begun to penetrate into the teak surface. There are only one was to do this:
1. Oil removal. Wash with Trisodium Phosphate to dissolve the 'dead' oil
2. Sand back to raw teak (Caution: the teak used in Tayanas was Burmese/Thai teak and if you get it hot by sanding ... it may turn 'dark brown' in 'zones' where there are 'sap pockets' ... so sand with light pressure and 'keep the sander moving'). Totally forget the 'heat gun'.
3. Bleach the sanded teak with oxalic acid, etc. (Paint store 'wood bleach')
4. Apply 2 uniform coats of acrylic sealer (if you like 'normal-hue varnished' teak, omit this step).
5. Varnish (oil, tung oil based) - typically 5-6 'snot coats', flat sand with 400 grit, then 2 final coats. I like to apply the final coats with a roller and tip-brush (or sometimes spray it).
6. If semi-gloss finish desired then 'hand rub' (bare hand!) with rottenstone + oil; If gloss finish ... then 'rub' with rottenstone + water; if matt/satin finish ... rub with pumice + oil.
There is very little 'veneer' inside a Ty37 and where you find it it will be THICK (3/32 - 1/8"+ thick) so you can sand deeply if you must. Most of the interior of the Ty37 is solid 'stick built' teak; and, as you already know the joinery was done by 'masters'. The sole is ~1/8 - 5/32" teak veneer over ply. The amount of SOLID teak inside a Ty37 nowadays is worth a 'kings ransom' - suggest you make it 'bright', bleach it if you like 'light', and use an oil based varnish .... Not butt-ugly 'cetol', not 'urethane', not 'paint' ... real oil based varnish.
If you can, use 'hard' or 'bar top' varnish - will be difficult to find or find someone who will custom make it for you. 'Spar varnish' is too soft for inside a boat as it easily scratches and 'dings'.
BTW/FWIW- the interior portlights and frames can be 'restored' (back from 'verdigris green') by use of citric acid, sanding/polishing, then spraying with a clear urethane. I also do this on my binnacle and exterior portlights, many urethane coats for exterior.
RichH Ty37 #423
Last edited by RichH; 11-30-2010 at 08:13 PM.