DeRail Bat Bio-Repellent Gel 250g RM70.00 DeRail for bat is a CONTACT repellent and irritant. In order for it to work it must be placed in areas where bats will come in contact with it and get the product on them. When this is achieved, bat will look for ways to exit from the treated area. DeRail for bats may elicit a stress response that often lower its normal resistance to new things and may enhance operation of current mechanical traps and baits. Add to cart SKU: DeRail 250g. Categories: Bat, Outdoor Pest, Pest Control. Tags: Bat, Outdoor Pest.