Your choice for rust stains.

[Truckcab79]

Finally got to the ‘rust’ job. I’d had a play with the Oxalic acid at home on a rust spot in concrete. Seems to work pretty well. Was expecting some impressive ‘fizzing action’ like brick acid but was disappointed to see that it just sits there working. ?

Job had multiple heavy rust spots on sandstone and for the worst ones I made a paste of the acid crystals as I soon found that dissolving in water it seems to become saturated at a relatively low concentration. The rest were sprayed with a ‘strong’ solution.

Pleased to say it did the trick. 90% gone. Oddly the worst really heavy ones disappeared entirely. Some of the less bad ones disappeared less. Overall though very pleased as is client. Couple of pics. Not sure these are the same stones to be honest but an indication of some of the worst starting points and the best results.

And a couple of the patio overall. Pleased with the result. Will be repointing it tomorrow.

Thanks all.

And a couple of the job overall.