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Ways to renew seams
Whitewashing and painting the seams. This is quick, economical, but short-lived. This method is unlikely to be suitable for a bathroom and will only last six months;
New grout. This is easy, but it will only work if the joints are at least 2 mm deep (you need the fresh layer of grout to fit and completely cover the old one);
Special paint for seams. This works both as a tone update and as its support. This option can even be used on specific “outdated” areas, if a fragment has lost the desired shade.