Most advice on talk or any hardwood is contradictory. Here's my experience.
If you needed to protect from very high temperatures, splash on any varnish
etc to keep the moisture in as much as possible, during the wortst hot weather
, til it cracks off and you can treat with some oil or well thinned oil based varnish
. We actually paint
non visible parts
with enamel paint
, simply for its preservative effect / but then it can get to 45c + in Oz.
Never scrub with a brush, especially decks. Sand or better still use a heavy flat stone.
teak it just falls off!