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Muriatic Acid for fiberglass shower/ tub

August 12, 2009

Q. I am planning on painting my fiberglass shower/ tub. I have been researching how to do this. I have read to use Muriatic Acid or acetone to clean the shower after sanding.
What is the difference between the two, and which is the best to use?

Sam Beck
homeowner - Grenada, Ms


Muriatic Acid

August 13, 2009

A. Hi, Sam. Acetone is a solvent and generally a good cleaner for fiberglass, although it is flammable. Muriatic acid might be used for removing excess grout, perhaps around a tile shower. It's hard to comment on what you may have read, not knowing what you read :-(


Ted Mooney,
Teds signature
Ted Mooney, P.E. RET
Pine Beach, New Jersey

December 31, 2016

Q. This is a question. Can you use muriatic acid to clean grout from a fibreglass tub.

Barbara Kaufer
- Catskill, New York, USA

December 2016

A. Hi Barbara. It's almost impossible to answer abstract questions well, but muriatic acid attacks fibreglass slowly if it all, so judicious use of diluted muriatic acid probably won't harm your fibreglass tub. But are you sure you are thoroughly familiar with muriatic acid? You need goggles, gloves, excellent ventilation, and great care ... as it is dangerous to you, and even the fumes can destroy chrome, stainless steel, and other metals.


pic of Ted Mooney
Teds signature
Ted Mooney, P.E. RET
Pine Beach, New Jersey
Striving to live "Aloha"

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