Whenever you stain wood you’ll know you’ve done the job right once that surface has a nice even color.
But sometimes, just sometimes, even when you’ve done everything right, things can still go a bit pear-shaped through no fault of your own.
Like say, for example, when unsightly white residue starts cropping up across that wooden surface or decking. Just where on earth is all that white residue coming from after you’ve finished staining?
When you apply wood stain, it works by soaking into wood pores. As it dries, (and the solvents in wood stain evaporate), the stain changes the pigment color of the wooden surface.
However, if moisture gets trapped in the stain as it begins to evaporate – for example the air around it is humid – then that will cause wood stain to dry with a milky white appearance.
You see, the drying process is absolutely key to wood stain working effectively. And stain can take anywhere from 24 to 48 hours to fully dry.
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So, anything that disrupts the drying process during that time, (moisture, humidity, damp, rain, etc), is going to create all of that white-discolouration on wood.
Basically, moisture is the culprit creating that white residue. However, if you keep reading, you will learn what you can do to fix it. And how you can avoid it happening again in the future…
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So, Is Moisture The Only Reason Why Wood Looks Cloudy After Staining?
Water, damp, moisture… call it what you will. But if it lands on wood stain as it is still drying, then that will cause the milky residue look. This effect is often referred to as ‘blushing’.
However, the other most common reason for a cloudy looking stain occurs when you apply a water-based top coat over wood stain. Adding a water-based top coat to an oil-based stain will cause the stain to become cloudy too.
That is because the oils in wood stain will get into the (still wet) water-based top coat as you brush it on. And, well, oil and water don’t mix so you get what you get… which is a cloudy looking stain finish.
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Is This Also Why There Is White Residue On My Decking After Staining? Yes, it is. White residue on decks is due to moisture getting into the stain before it has a chance to properly dry.
How Do You Fix A Milky Finish On Wood?
Your two best options here will both require you to remove the stain (either some or all of it).
Remove Part Of The Stain
This involves removing just enough of the stain so as to get rid of the milky white looking layer of it.
You will need the following
- Steel Wool (Grade #0000 – the kind used for refinishing or polishing)
- Mineral Spirits or Paint Thinner
- Tack Cloth or Rags
- Respirator Mask
Once you have these items ready, here is what you need to do:
- Step 1: Apply Paint Thinner or Mineral Spirits onto the wood stain.
- Step 2: Run the steel wool over the wood stained area to remove the stain. The stain should become visibly lighter as you remove it.
- Step 3: Once you’ve removed enough stain, run a tack cloth over the surface to remove all excess spirits/thinner.
- Step 4: Leave the wood to dry completely (waiting up to 48 hrs).
- Step 5: Reapply wood stain.
Now, one of the difficult parts of only removing part of the wood stain is uniformity. It’s pretty tricky trying to remove wood stain evenly from across the surface.
So, what we typically opt for an recommend is that you remove the stain completely instead.
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Remove All Of The Stain
This option involves getting rid of the stain completely and starting again.
Removing stain isn’t difficult, and only requires a few simple tools. You will need to make sure you have the following to hand:
- Steel Wool
- Plastic Scraper
- Fine Grit Sandpaper (120 Grit, 150 Grit and 180 Grit)
- Tack Cloth or Rags
- Respirator Mask
And then once you’re ready, follow The Home Depot’s easy beginners guide to getting rid of that wood stain below:
Once you’ve removed the wood stain, you can go ahead and reapply it again.
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So, To Wrap Up
At the end of the day, if you get white residue after staining, then you need to be pointing fingers at the environment.
That is because if you want to avoid any cloudy affects after staining, you need to make sure wood stain is allowed to dry in a low-humidity area.
Essentially, any rainfall (on outdoor decks) or moisture (from indoor humidity) will mess up wood stains ability to dry properly.