What happens if the substrate is not entirely dry?

Then you will not get a good adhesion of the to resin the substrate. The repair resin will partly react with the moisture in the wood and will not achieve the intended final properties. This results in a repair that is not durable.

What is a pure epoxy?

This is an epoxy without fillers. The addition of (cheap) fillers – such as glass beads or chalk – results in the presence of unbound components after curing. The loss of elasticity due to the use of fillers makes a repair vulnerable to cracking and detachment.

Can DRY FLEX® SF be used without milling?

Yes, DRY FLEX® SF is a filler and can be used for natural cracks and small defects (< 6mm) in new and unpainted wood. Any raised wood fibres on the contact surface can be removed by sanding.