I always use Penofin, and I do brush in between the boards.
Condensation is ok. Apply in the afternoon, as Penofin doesn't like sunny day application.

steve

Thanks Steve. You DO brush between the boards! I thought people would think I was obsessive compulsive asking such a question! :)
Can I assume correctly that I should also wait for relatively cooler temps? I would guess a 90 degree day, but in the afternoon shade is a no go?
Kim

Kim,

I'm also obsessive compulsive. I apply penofin with a pad on a stick, and my assistant brushes the gaps. Heat is ok if you're in the shade. Sun is a no-no.

steve

Ahhhhh...Penofin users!!!
We go through a LOT of it here in Fargo, ND.
(and Sikkens too)

The Wooster "Stainer" brushes are popular here for deck staining.
>>> These have a big "head" that you can unscrew the handle from.
>>> Screw in your shop-broom handle, and stand up to stain the deck!
>>> Just a quick 90deg. turn of the pole/brush, and you're stainin' between the boards as you go...!

Make sure you wipe off excess Penofin after the 1st coat...
* Meaning >>> Whatever doesn't soak in after 15 minutes or so, is just gonna dry on top and look "varnishy".
* Yeah....DON'T apply in direct/hot sun. It dries too fast to soak in under those conditions.

Faron

Thanks for all the tips. Much appreciated. I hope to be applying the Penofin within the next couple of weeks.
Kim