Tank liners and methods for installing same

An epoxy primer, comprising:

• epoxy resin system comprising:
• from 30% to 99.9%, by weight of the epoxy resin system, of a liquid bisphenol A epichlorohydrin epoxy resin, having at least two epoxy groups per molecule;
• from 0.1% to 70% parts of the epoxy resin system, of a elastomer modified epoxy resin;
• from 0 to 50 pph of a liquid epoxy functional modifier, and
• a curing agent in an amount effective to cure the epoxy resin system.

A system for protecting substrates from corrosive agents comprising:

• a composite liner comprising:
• a chemically resistant layer, comprising a chemically resistant elastomer;
• and
• a tie layer, disposed on the chemically resistant layer, said tie layer comprising:
• a rubber system comprising:
• from 10% to 99% of the rubber system, an epoxidized rubber;
• from 1% to 90% of the rubber system, a halogenated sulfonated polyolefin elastomer;
• and
• from 0% to 60% of the rubber system, a low viscosity halogenated rubber having a viscosity less than 3,000 paschals;
• an additive system comprising:
• a curing agent in an amount effective to cure the epoxidized rubber;
• and
• an epoxy primer, for coating the surface of the substrate, comprising:
• an epoxy resin system comprising:
• from 30% to 99.9% of a liquid bisphenol A epichlorohydrin epoxy resin, having at least two epoxy groups per molecule;
• from 0.1% to 70% of a elastomer modified epoxy resin;
• 0.1 to 1000 pph of primer additives comprising:
• from 0 to 50 pph of a liquid epoxy functional modifier, and
• a curing agent in an amount effective to cure the epoxy resin system.

A tie gum composition for adhering an elastomer to as substrate comprising:

• a rubber system comprising:
• from 10% to 99% by weight of the rubber system, of an epoxidized rubber;
• from 1% to 90% by weight of the rubber system, of a halogenated sulfonated polyolefin elastomer;
• and
• from 1% to 60% of the rubber system, a low viscosity halogenated rubber having a viscosity less than 3000 paschals;
• an additive system comprising:
• a curing agent in an amount effective to cure the epoxidized rubber.