My sills were original but the holes were still blocked, as were the hood drains, this is the most likley cause of MOT fails in the uk, lack of maintenence, sills rotting from inside as hood drains have become blocked sills fill with water, the Waxoyl is a rust inhibitor and protection for the sill, you have to stick it in a bucket of hot water then pump and spray it through a long clear tube, I did the inside of my doors at the same time.
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