There is no definitive answer to this question since there are so many factors that can affect the choice of mortar for tuckpointing, such as climate, type of masonry unit, and personal preference. However, a common choice for mortar in tuckpointing is a Portland cement-based mortar. This mortar is strong and durable and can withstand weathering and pests. It also has a relatively long lifespan compared to other mortars.

There is no definitive answer to this question since every mason has their own preference for the mortar mix they use for tuckpointing. However, a general guide for choosing a mortar mix is to use a type M or N mortar when tuckpointing brick, and a type S or T mortar when tuckpointing stone.