Stevens Bridging Filler No1 Kit 600ml. Stevens Fibre Bridging Filler is a professionally formulated products that has hundreds of practical uses. Stevens Bridger is a jam like substance that contains fibre glass strands. Stevens Fibre Glass Bridger can be sculpted and moulded and over finished with body filler to give a super smooth finish than can be sanded and sprayed. This product is ideal for metal, wood plastic or other fibre glass repairs