Back in my High School days about 1973 my woodwork teacher told us about overpriced Teak Oil and gave us his recipe which worked well. I think I've also made it with PolyUrethane instead of Varnish though the project escapes me at the moment.

1/3 Boiled Linseed Oil
1/3 Varnish
1/3 Thinner

The problem I have now is in Southern Mexico I can not find Linseed Oil of any type. Nor Tung Oil. The only items I've found are coloring stains and Varnishes and Thinners. Also liquid poisons to treat against termites which are common and reason for Concrete houses and steel door frames.

Varnishes also seem to repel the termites

Tuesday, March 21, 2000 at 2:00:00 AM UTC-6, Alec Fry wrote:
Something I use quite a lot - and which always seems exorbitantly
expensive - is teak oil. I've often wondered if it's possible to make my
own, but I have never managed to discover the formula.

Recently I tried a mixture of 50% linseed oil and 50% white spirit which
seemed to work quite well. Does anyone know the "proper" formula, please - I
imagine there must be some sort of preservative or fungicide added.

Alec