How to finish a teak bathtub
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tub picture

Hello,
I know nothing about woodworking or finishes. I am purchasing a bathtub made of Iroko wood and I am worried that 1. I won't be able to use soap and shampoo without damaging the wood, and 2. that the wood will erode over time. I know that wooden bathtub companies like this one (americanwoodtubs.com) use a fiberglass finish on their tubs. Can I just paint some kind of similar finish on the Iroko tub (which is already finished with linseed oil and lavender oil). If so, what finish should I buy/use? Or, will the tub be OK as-is? Thank you so much for your help! - Sarah