We do not recommend dyeing carpet in your home.
Dye a rug with rit.
Wearing rubber gloves mix 1 2 cup of rit all purpose liquid dye with 2 cups of very hot almost boiling water.
This process took about 15 20 minutes.
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I found this to be a bit of a pain.
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Let the rug dry outside on a very warm and sunny day until it s completely dry about.
Wet the carpet and place it outside on a tarp.
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This works great if you re prepared to disassemble the whole machine to clean out the dye before returning it.
When the rug is saturated with dye let it dry in the sun for about an hour.
The more synthetic in the fabric the less dye it will absorb.
I just laid it out on the ground a bucket of hot dye and a scrub brush scrubbed it into the carpet on my hands and knees.
That being said i dyed an old rose colored print carpet 10x12 with green rit dye.
Vinyl fabric and carpet dye diy repair kit repair stains discoloration and natural wear.
Pour dye solution into a spray bottle or use a preval spray product from our online store.
Then pour straight rit colorstay dye fixative into your paint sprayer and sprayed the entire rug again.
Use a pot holder mitt if bottle is too hot to handle.
Carpet dyeing is best done by professionals who use equipment that can attain high temperatures and high pressure combined with special chemicals and surfactants needed to apply the dye.
I also found that removing there excess water after spraying the dye made the dye not as dark and end result was a bit blotchy.
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You can keep your color fresh by setting it with a vinegar and salt solution both during and after the dying.
Above answer is interesting and probably correct.
Using a spray bottle is an interesting idea for applying dye to large items.
I originally started this using a rug doctor steam cleaner.
Different fabrics do absorb the dye differently.
I have dyed a lot of clothes but never a rug.