A chemical reaction involving resin and Fiberglas was blamed for a fire in a barn Friday that caused an estimated $100,000 in damage.

The owner/operator of a semitrailer rig had done some body work on the hood of the rig, then went to a hardware store, Bethel Twp. fire Assistant Chief Jennifer Cotterman said.

When the man returned to his home, 11408 Lower Valley Pike, he noticed smoke coming from the barn in the backyard and called the fire department, Cotterman said.

The man, whose name was not available, had pulled the rig out of the barn before fire crews arrived at 3:57 p.m., but there were chemicals, diesel fuel, oils, tires, a forklift and other items still in the structure, the assistant chief said.

Crews from several fire departments quickly knocked down the fire, which left the structure standing but damaged the skylights, she said. Damage was estimated at $50,000 to the contents and $50,000 to the structure.

A hazardous materials unit was dispatched but not needed because the fear about chemicals in the barn were not realized, Cotterman said. No one was injured, she said.

In addition to the hazmat unit, fire crews from Bethel Miami, New Carlisle, Wright-Patterson, Enon, Springfield Twp., Pike Twp., Hustead, Huber Heights and Fairborn assisted Bethel Twp.