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If a stained piece is still tacky, can you spray a sanding sealer over it with no adverse affects?
what kind of stain?
I doubt it would be safe to apply a sealer coat while the stain is still tacky.
I know I wouldn't do it.
Since we have no idea of what kind of sealer or stain, very hard to guess.
Generally thats a strong no. Most stains at the very least contain linseed oil, and even the fastest drying stains require at least 1-2 hours before you can coat it. In most cases my stain work is done at the end of the day, so it can have all night to dry.
I never coat a stain that feels tacky. A good test to see if the stain is ready, is to see if you get any color on your fingers when you run them across a stained surface.
If the stain is slightly tacky I have used #2 steel wool to polish off any unhardened stain then used the sealer. Where the stain has been removed by the steel wool the wood will be bare enough for the seal to soak in and dry.
Steel wool? And lacquer finish? The two don't mix very well!
Conversion varnish sealer will penetrate any unhardened oil and turn it to a solid.
if the stain is tacky, NO.
the stain must be completely dry.
stains I mix up with 844 or 866s can take up to a couple hours to dry completely, depending on color load.
d59s about 30 mins, dyes 10-15 mins
stain bases and saturation are also a factor...and can take a full day or longer to dry
if it tacky it will cause bleed thru and may give you adhesion issue in the long run
You never want to seal and oil stain before it is dry. Especially if it contains linseed oil. Linseed oil not only needs to dry but it needs to oxidize. The catalyst for this oxidization is oxygen. If you seal it too soon you cut off the oxygen it needs to cure. Down the road your finish will peel or flake off. When you see finish flaking off, turn the chip over, if there is stain color on the chip the stain did not cure to the wood and it is a cohesion failure of the stain. not an adhesion failure of the coating. If you want to go fast in the paint room use stains that are designed to be sealed quicker. There are plenty of mfg that make short oil stains. Trying to seal a wet stain will bite you every time.