Sealing (re-sealing) a sealed floor with worn out patches (Home depot, Lowes, Hardware, Los Angeles)

[Francis A.]

Hello,

I have to reseal parts of a kitchen floor in my duplex. I'm learning the hard way after I initially sealed the tiles which are white and porous. 

I used SEALER & FINISH (GLOSS) by TILELab. I gave the floor 3 coats but I did it over a 24 hour period and did it in sections. 

In an instance like this, do I need some kind of sealer remover to wipe down the offending sections before resealing?

I will be making a trip to Home Depot but I thought a little pre education from here might help me ask the right questions.

Thanks in advance!

Francis