linseed (flaxseed) is the oil in oil-based paints and varnishes. it is
often used by itslef (boiled linseed oil) diluted 50% with kerosene or
paint thinner so it will soak into the wood grain. It costs less than
paint or varnish. I use it that way alone on the inside or as a
primer-sealer on the outside before painting or varnishing.

wendy2b2002 wrote:
I have a sailing boat that's decking is marine ply, it's showing it's
age as it was left for three years uncovered and the marine ply is,
although sound, discoloured and stained in place, as well as starting
to cracj a bit. Is it possible to apply something like Teak oil before
marine varnish to help revive the wood?