Powerwashing Interlocking Brick
 

Recently power washed my interlocking brick. I understand I need to put sand in between the gaps caused by the power wash. Two things.

1) I'd like to understand how to put the sand into the gaps
2) Do I need to seal the brick?

spread the sand over the surface and work it back and forth with a wide push broom, lightly water it down to settle the sand into the cracks.
you don't necessarily have to seal the brick but, if you would like to do that; seal the brick using a garden sprayer jug with pump and wand.

Thanks! Very helpful.