Monthly is completely unnecessary. There are several good sealers that when applied properly will only need reapplied once every 5 to 10 years.

Our granite installer recommended a sealer applied once per year and recommends the "one they use and also sell". I have not asked what it is but will.

Curious as to how it is applied and is it an easy process, apply with cloth or brush and how is it done?

Visit the link below, lots of great info from different professionals with lots of experience.

Event though the thread is about marble the info applies to granite as well.

Here is a link that might be useful: Sealers

Cross posted from my reply to someone in Bathroom Forum:

I really liked using STT's SB sealer (now called Deluxe sealer?). It has minimal. minimal odor, and is super-easy to use. Apply the sealer (I used disposable foam brushes), let it sit (8 hrs-overnight) to absorb (new instructions, as of a few years ago), reapply if your stone warrants it, and buff with a clean dry cloth(s)--old cotton T's, shop towels, etc. Doesn't need to be reapplied for 15 years I believe.

I haven't used it on my kitchen counters (but could, I'm pretty sure it is food prep surface-safe)--our fabricators used a sealer/polish that they were importing from Italy at the time.

Thanks so much!!!!