If you are talking about the parallel lines up and down the lumber that are
slightly depressed, those would be saw blade marks. The way to make them go
away is to remove them with a belt sander. But with treated lumber, I'd get
a decent breathing mask, not just the cheapo paper ones. Down here, we have
CCA treated lumber (which I wish they would have LEFT as illegal and phased
out) and breathing that arsenic really isn't a good idea...

John
in Houston



wrote in message
oups.com...
I am building a patio cover and using 4x4 treated douglas fir posts
which I want to then paint. What is the best way to cover the hash
marks from the pressure treatment. Location is in Southern California
where the temperature can reach 100` with direct sunlight.

Thanks for any suggestions.