Mastic is an adhesive that, along with thin-set mortar, is used to stick tile to wall or floor surfaces before grouting. While mastic does have strong points, such as great adhesive properties and adaptability to many substrata, high performance in wet areas is not one of its high points.

Should I use mastic or mortar?

Mortar can be used with most tiles, and glass and stone tiles typically require mortar. However, mastic is specifically designed for use with ceramic tiles, and is also suitable for use with some porcelain tiles.

What is the difference between mastic and adhesive?

As nouns the difference between adhesive and mastic is that adhesive is a substance, such as glue, that provides or promotes adhesion while mastic is an evergreen shrub or small tree, , native to the mediterranean.