One of my worst mistakes happened on an extra I talked the customer into! Was doing a finished basement and talked the homeowner into installing a recess light above the fiberglass tub. While installing the can for the recess I dropped my kleins into the tub putting a nice chip in the finish. Cost me $125.00 to have a chip, smaller then a quarter, fixed. Trust me I don't go near those tubs with out putting drop clothes in them !