I asked this before, but some time ago because my news server doesn't have the thread. I've forgotten what people's comments were. Sugar soap is sold as "the perfect preparation for painting ... simply wash over the area to be painted .... no need to rinse ... provides a key for the new paint..." etc etc. Well every time I use it (including this evening), I can never detect the slightest difference in the area being prepared. Sure, it's cleaner (as indeed it would be if I'd washed it over with warm water) but I can neither see nor feel a "key" for new paint. I'll be undercoating before glossing, but I do wonder if I can miss out the sugar-soap bit in future. Any comments folks? Ta, John

On Fri, 12 Jun 2020 13:36:23 +0100, Andrew snipped-for-privacy@mybtYes it is, if it avoids the need for lots of rinsing to remove theremains of the detergent.

What use is sugar soap?

Jan 05, 2016 Last reply: 6 years ago 21 Replies

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Scott 6 years ago

Yes it is, if it avoids the need for lots of rinsing to remove the remains of the detergent.

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patrickfrance 5 years ago

My understanding is sugar soaps, depending on brand, main ingredient is sodium phosphate. TSP is Tri sodium phosphate and is used in labs to clean walls before painting.

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