hi there Bill
I have seen this boat before, as in Plan, and I am sure its not from MyHobbiesStore. However, I think it may have come from Hobbies Weekly Plan - enlarged. Very old magazine - and if it were me I would use Zpoxy Resin on the outside and give it at least 3-4 coats. Allow the first coat to soak well into the timbers. When the first coat has dried, rub it right back to the timber once again, thus leaving Zpoxy in the gaps and in the grain of the timbers. Follow on then by another 2-3 finishing coats - I suppose you could add either a very fine aircraft cloth between the layers of Zpoxy or even tissue matt. Me, I would use tissue matt. This is because tissue matt soaks up the resin & the fibres begin to loosen and break - you can work these into the tight radius' around the keel where the keel meets the planking without the aid of incorporating air bubbles in there. Remember, the trick with working with any material with resin is to apply the resin first of all and then the cloth/matt over the top and stappel the resin through the material or the matt. This prevents air bubbles from being trapped. As far as epoxying/resining inside the hull goes, yes, definitely do this! It has been proven many times that timber swells in dampness, it doesnt even have to have water on/around it to swell and if you have only sealed one side of it - when it becomes damp or the moisture is in the air, it begins to swell and you have restricted only one side of the timber and it is going to begin to swell - and burst away from your bonding on the outisde. Timber has twice the expansion rate of plastics when in a damp environment. So do seal the inside.
aye
john
bluebird