 Can I use the grout and the tube? It 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.