Salat Al-Fatih is regarded as one of the most powerful prayer upon the Prophet SAW and its benefits are far too many to list here. Memorize it, recite it and see for yourself what Allah will do for you.
If you are facing hardships or blockages in your life, this salawat is known to remove blockages, bring about great openings and seal away harmful influences in your life.
Many scholars encourage reciting it at least once daily, but you can recite it more with any intention as many times and it is will always benefit insha'Allah.
Why should I send prayers upon the Prophet?

Because Allah says in the Quran “Allah sends His Salaah (Graces, Blessings, Mercy) on the Prophet (Muhammad), and also His angels (Angels ask Allah to bless and forgive him). O you who believe! send your Salah on (ask Allaah to bless) him (Muhammad), and greet him with the Islamic way of greeting (salutation, i.e. As?Salaamu ‘Alaykum)” [Quran: al-Ahzaab 33:56]
Can sending prayers on the Prophet PBUH really take care of our problems?
Short answer -Yes! It is narrated in the Hadith that Ubayy ibn Ka’b said:
I said: O Messenger of Allah, I send blessings upon you a great deal; how much of my prayer (dua) should be for you? He said: “Whatever you wish.”
I said: One quarter? He said: “Whatever you wish, and if you do more it is better for you.”
I said: Half? He said: “Whatever you wish, and if you do more it is better for you.”
I said: Two thirds? He said: “Whatever you wish, and if you do more it is better for you.”
I said: Should I make all my du’aa’ for you? He said: “Then your concerns will be taken care of and your sins will be forgiven.” Narrated by al-Tirmidhi (2457); classed as hasan by al-Albaani in Saheeh al-Tirmidhi.
Go my friend - send Salawat on the Prophet! And may Allah make you and I among those who are given the blessing of the company of the Prophet SAW.
The closest of people to me on the Day of Resurrection will be those who send the most blessings on me.” [Classed as hasan by al-Albaani in Saheeh al-Targheeb wa’l-Tarheeb.]