Brazing Attempt with MAPP Gas

What happens here

Using a MAPP gas torch, the presenter heats the cleaned area of the radiator. He then attempts to apply the aluminum brazing rod to melt and fill the pinholes. He tests how quickly the rod melts under the MAPP gas flame. However, he finds that the brazing material does not effectively adhere to the radiator, indicating that this method is unsuccessful.

Goal: Seal the radiator holes using an aluminum brazing rod.