When you get to the end, it’s easy to rush and quickly set the last few tiles because you want to see the mosaic done. That is when many of us get a little sloppy compared to how we worked on the rest of the mosaic. The edges aren’t even; there is adhesive squeezing out of the last couple of spaces; the spacing around the edges is awkward; and the grout haze is unevenly cleaned up. A clean ending isn’t about achieving perfection. It’s about giving the mosaic a sense of completion and resolution so that every little area seems deliberate and not haphazard.
Start Thinking of the Edges as the Mosaic’s Frame Stop thinking of the finishing details as an afterthought. Instead, think of the edges of the mosaic as its frame. Just as a well-chosen frame makes the art inside it look good, well-made edges can make your mosaic look finished. Before setting the last few pieces, look at the perimeter shape of your mosaic. Is it smooth and clean? Or does it wiggle because you’re cutting pieces to whatever random size will fit in the space? Sometimes the best way to avoid this wiggly edge is to remove a single piece that is disrupting the rhythm of the line. If you have one piece that is a hair too big near an edge, it might make the whole edge look wobbly.
Consider replacing it with two smaller pieces. Sometimes that alone can give you a better edge. Another mistake people make is leaving little accidental gaps in the spacing of the tile with the assumption that the grout will fill them in. Grout can help gloss over irregularities in your mosaic, but it can’t compensate for areas where the spacing was never resolved. When the mosaic is finished, those little holes will stand out, especially if they are in areas where the surrounding tiles were carefully spaced. Instead, before you grout, inspect your mosaic slowly and piece by piece, running your finger over the edges or tapping your pencil point on the surface to find where the spaces between pieces widen, where adhesive has oozed up into the gaps, and where a piece is a hair too high or low. I think one reason people get frustrated at the end and things start getting messy is because the mosaic is no longer the exciting novelty it was in the beginning when the design was first laid out.
It helps to remember that refinement and finishing is a type of craftsmanship, and that the last few tweaks are what make a mosaic look composed instead of slapped together. I have found that a little fifteen minute finishing session can make this process much less daunting. Spend the first five minutes looking only at the edges and decide what needs to be fixed. Spend the next five minutes fixing one area. This might mean replacing a border tile or scraping out dried adhesive to fix a little gap.
Then spend the last five minutes wiping down the surface with a damp cloth and looking over the surface of the mosaic from different angles and under different lighting conditions. A lot of little problems such as high or low pieces and smudges or dried adhesive become apparent when you look at the mosaic from an angle. The short sessions prevent burn out and prevent you from getting so impatient that you start rushing and making things worse. Your grouting and grout haze removal go better when you have already treated the surface of the mosaic with respect.
If the spacing between the pieces is good and the edges are secure, the grout enhances the design instead of covering up flaws. If you take your time and wipe away the haze instead of scrubbing at it, you will probably have better results. It isn’t long before you realize that finishing and grouting are not something separate from mosaic art. It is part of the same process, and the same principles that apply to the rest of the mosaic also apply here: patience, attention to detail, prompt problem solving.