Pressure-Treated Wood Preservative Tip

If you've drilled some pressure-treated lumber for a bolt, you need to protect the inside of that bolt hole with some wood preservative. You could use a small paint brush, but there's a better way.

[stFlyingeagle]

What I have done, drill the holes in all the posts. 
Take wide masking tape and cover one side of the hole.
flip lumber over and fill holes up. let is sit and soak in.

[johnlsmith]

And end grain.  Treated lumber is insect-proof (more or less), but not waterproof.  Don't neglect to seal the end grain.

[michaelt]

USELESS! What IS the actual preservative? FAIL!