On Jun 15, 10:51 pm, wrote:
Hi

What varnish should I use for (treated softwood) wood that stays wet
more or less all day? The first stuff I tried failed very quickly

Get a tin of Cuprinol or something similar. You can get water based
stuff but oil based is superior. But that will mean you need a run of
nice weather which means holding off until 9th July.

You might get away with varnish then too, especially if the first week
is also dry.