One should wait for at least 72 hours before removing the excess. Also, do not try to scrap it off, use a sand paper to sand it off so you have better control and you will get a smoother finish.
With regards to the pinholes- since it was done recently, it seems that there was air locked in, and as the air passed out of the sealing, you were left with pinholes.
With regards to the pinholes- since it was done recently, it seems that there was air locked in, and as the air passed out of the sealing, you were left with pinholes.