Deck stain blotchy?
There are two reasons deck stain can turn out blotchy. The most common reason is overapplication of the deck stain. The other reason most people have their deck turn out blotchy is that they did not prep the deck properly before applying the deck stain.
- The two main causes of blotchy deck stain are overapplication and improper deck prep before staining.
- Overapplying deck stain prevents the product from soaking into the wood properly, leaving some areas tacky and uneven.
- Oil-based deck stains are especially prone to blotchiness when too much product is applied and cannot penetrate the wood.
- Uneven application causes parts of the deck to dry normally while other areas remain blotchy and sticky.
- Proper deck prep including sanding and cleaning is essential for stain to penetrate and protect the wood correctly.
- Always check the weather forecast before staining and ensure no rain is expected for at least 24 hours after application.
Why does overapplying deck stain make it blotchy?
Over-applying deck stain keeps it from soaking into the wood properly, but it still dries somewhat. The liquid sits on the wood, unable to penetrate, particularly with oil-based deck stains. This means that parts of the deck could be dry while other areas are blotchy and tacky. This is the result of not applying the deck stain evenly and using too much deck stain.
Why does prepping incorrectly make the deck stain blotchy?
Prepping correctly before applying deck stain is important because without it the stain cannot penetrate the wood, beautifying and protecting it appropriately. Prepping should include sanding, cleaning, and checking the weather to ensure there will be no rain in the next 24 hours. Proper prep to avoid blotchiness is different for different situations.
More information on how to properly stain a deck
- How Long for Deck Stain to Cure and Dry
- Deck Staining Temperatures
- Why Is the Deck Stain Still Sticky?
- Do I Prep After Sanding a Deck
- Best Deck Stain & Prep Videos
- What is the Best Deck Prep
For more info, see our Deck Stain Facts section with over 150 simple Q&A articles that answer all the questions that you have regarding deck staining, cleaning, and prep.
We just had our deck restrained, it was properly prepared before staining, they used oil based stain in a dark brown color, my question is now it looks bloctchy all over, like its wet but its not. So upsetting, what can we do to fix this ?? Any help would be great.
Please post some pics in the comments and we can advise from there. Overall blotchiness on a recoat is almost always a prep or application issue, not the stain itself — either the old coating wasn’t fully removed evenly before restaining, or the stain sat on the surface instead of penetrating evenly in spots (that’s the “wet looking” sheen you’re seeing).
What stain brand did they use?
Hi, they used sherwin williams super deck oil based color stain. I will post pics. The main large part of the deck looks fine but the part that’s the worst is the wrap around part of the deck. Thank you
That looks like a bad application job, and it looks fully opaque. You cannot strip this off. You may need to sand to fix.
I have a brand new deck (built about 6 months ago before winter). When I went to buy deck stain now that the weather is getting better (I purchased water based semi-transparent in white) the person told me I should fill in any cracks with wood filler. BAD IDEA. It went on like peanut butter so after some research I found I needed to sand off the horrible abomination. Since the entire deck wasn’t covered with the wood filler, I only had to sand certain parts and it all came up but required 36 grit belt sand paper to get it off. My question is can I now just sand the entire deck with 80 grit or does everything else also need to be sanded with 36 first and then stepped up in grit? I obviously don’t want blotchy stain but read on some sites that the sanding only matters for smoothness and not how the deck absorbs the stain and on others where it does. Appreciate any advice! Thank you!!
You should never use wood filler on a deck when using a semi-transparent stain, it will not blend. You will need to remove 100% of it or it will show through. Pain as you already know.
We would sand it all evenly with 60 and then 80 grit. We would then let it sit for 1-2 months to acclimate. The final prep would be a wood cleaner and a wood brightener followed by your stain.