I have a customer who has brick fence posts. Someone previously took off the rust and left a white haze on the bricks. White Ox’s label says to beware of bricks btw. I’m wondering if there is a way to remove the white haze? I may try sand blasting but im hoping there is an easier / better way.
First let me say I love your logo!
Also. I am wondering if the white effect is a residue. If so I might experiment with some type of an alkali to see if it might neutralize that residue. Just a guess. This is definitely outside of my experience. But I am sure you will get more input. Give it a few days.
Henry
hey thanks Henry! I have noticed this effect myself after using oxalic. it tends to make everything paler. I guess that’s the point as a rust remover. I read that washing soda would neutralize it. perhaps if it’s put on quickly… bit many times I need a few applications of the oxalic acid and need that dwell time
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Could be efflorescence. Heard good things about f9 efflo remover
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acid on brick “dissolves” the stone. Use a mild alkali and scrub the areas to neutralize
if I neutralize the acid won’t it be ineffective against the rust? I need a it to dwell
If you have removed the rust, you need to neutralize the residual acid left behind that turns the stone white
one restore worked for me
one retore will work
ok I’ll try one restore. I tried sandblasting and it worked but seems to make the brick richer in color than the rest of the already good bricks. I then tried pressure washing with a 0 degree red tip and it worked better and quicker.
but it was still slow.
You should never use a red tip. When it fully dries you’ll have zig zags all over it. Plus you don’t want to use too much pressure because you can cause efflorescence much easier by injecting water into the brick and mortar, allowing it to collect more minerals as it dries and wicks it’s way to the surface. It only looked better because it was wet and efflo disappears when wet. http://www.cambridgepavers.com/dfiles/Efflorescence.pdf
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To anyone else who still has a red tip… THROW IT AWAY
A red tip has many uses. It will etch but if you always have zig zags perhaps you aren’t using it properly. Its not meant for all surface cleaning. Also it was not efflorescence. And I’m not afraid of this happening. Also I let it dry before I concluded it was a success.
False. Its garbage.
Fixed that for you
Thats a more accurate representation of how it goes down [MENTION=6944]buzzlightyear[/MENTION]
