Water and moisture can cause some uncured polymer characteristics like storage modulus, glass transition temperature, viscosity, gelation and relaxation time of polymers to be changed. Recognition of these parameters affected by the moisture is essential and should be addressed at first.
Please read this article
https://www.ncbi.nlm.nih.gov/m/pubmed/16765432/
Water and humidity are usually the enemy of adhesion since the water molecules bond to the same sites the adhesion uses for bonding to an adherend. This is the reason adhesion will be poor. The outstanding adhesives are RTV which uses the water molecules to bind to the surface.
salam Alaikum
the water molecule considered polar molecule, also the resin molecule considered polar molecule. therefore, the water molecule will reacting with its and fabricate bond with resin molecule and for this reason will decrease the viscosity and vary the characteristics of resin.
Adhesion is the attraction of molecules of one kind for molecules of a different kind, and it can be quite strong for water, especially with other molecules bearing positive or negative charges. ... This is because the water molecules are more strongly attracted to the sides than to each other.
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