 Can I use the grout and the tube? Depends on the color. You know, if the color matches. It's really just a matter of getting the color right. I'll tell you what I did. When I grouted my shower, and I have like a bathroom, you know, tub and shower all together. And the last time I grouted that, what I did is I actually bought like three different grouts. One that was like a little bit lighter, a little bit darker. One that I thought was pretty close.