1. When should I use a primer or a surface promoter?

When dealing with substrates with low surface energy activity, such as plastics, it usually requires enhancing the adhesion to achieve sufficient bonding strength. The selection of the primer type depends on the specific application.

1. Should the primer be applied to both sides?

In most cases, it is only necessary to apply the primer to the side with poorer bonding force. If a very fast curing time is required or there is a gap larger than 0.15 in the bonding area, it is usually necessary to apply the primer to both sides. When using the primer, it is advisable to use a small amount.