We recommend spraying the substrate with a fine layer of water as the foam needs moisture to cure properly. Benefits of this include:

  • Better cell structure
  • Improved adhesion
  • Faster curing times
  • Better foam in general

If the surface isn’t moistened there is a risk of the foam not curing properly and effecting the rate of expansion. The only exception to this is with 2K foam. This type of foam will harden without water because it contains a chemical within that will enable a reaction.