Cleaning Rust Stains on Bluestone – Countering Misinformation on the Web

August 9, 2014 Off By Torin Dixon
Rust on Bluestone

Rust on Bluestone

How to Clean Rust on Bluestone

There’s Much Misinformation on the Web

We receive numerous calls from concerned homeowners about Rust Stains appearing on Bluestone pavers. There are unfortunately many websites with “solutions”, but very few offer professional advice.

Katherine C. called us a few weeks ago from South Carolina, in a panic about rust stains on her newly installed $10,000 patio and walkway. Her mason, intending to clean off residual grout/cement haze near the edges of her Bluestone, used Muriatic Acid to clean her Bluestone. Muriatic Acid is a very powerful acid that is very effective on dissolving cement, but because it is actually Hydrochloric Acid, and is also known as “pertaining to brine or salt”, it can be quite reactive with Iron particles and ferrous minerals in the composition of Limestone and Bluestone.

Initially, the “cleaning” looked good, but within a few days, there appeared an orange stripe next to every grout joint. It was rust, leaching out of the pores of the Bluestone. Katherine tried every “solution” on the internet, using all sorts of home remedies, with no success at cleaning off her rust.

She found StoneCareOnline through a web search, and contacted us for assistance. We recommended a few inexpensive products to help her, and assured her that her Bluestone was not ruined. Here is what we typically recommend for Rust on Bluestone.

Perhaps the MOST important next step, is to Seal the Stone from Moisture!

Water, rain, and ground water seepage is the enemy of Bluestone. It is essential that you have adequate drainage around your Bluestone, and that water can quickly drain off the surface. Moisture (and salts) as you in the East, can quickly react with iron, causing rust.

R77 not only cleans the rust, but it also contains Rust Inhibitors to help prevent future rust.

Protecting Bluestone and all Natural Stone from moisture is easily done by applying HMK S31 Silane Impregnator. S31 Silane Impregnator can be applied to large areas using a low pressure sprayer, or using a paint brush. A synthetic tight nap roller can also be used, but you must roll very slowly to not generate air bubbles or foam when applying. Stone must be completely clean and dry, and Impregnator must be applied when stone is cool (50-80 degrees F).

Katherine raved about how well our products removed the rust stains from her Bluestone, and she was greatly relieved that she was not going to have to replace her expensive Bluestone pavers.

For additional advice, please Contact Us