Hello:

Have a deck that is made (thank goodness) from pressure
treated wood. Deck is about 20 years old.

Will be wanting to apply some product like Thompsons Water Seal
to it.

Questions:

a. Is Thompson's the brand to use, or are there "better" products available
?

b. How is this stuff applied ? Just swabbed on with a big, cheap,
paintbrush, or... ?

How about spraying it on ? If so, would you still need to smooth the
liquid with a brush ?

c. The underside of the Deck is high enough to walk under.

Should I also apply this stuff to the underside ? Brush or spray ?

d. How does one get the sides of the planks, seeing that there is about an
1/8 inch gap, only ?

Important to do the sides too ?

e. Does pressure treasted wood absorb any of this product, or is it pretty
much of a surface treatment ?

Just out of curiosity, how about regular wood: surface only ?

Thanks,
Bob