Hi everybody!
We have lot of work trying to speed up the finishing process of solid pine coffe tables.
In some pieces, we found open pores only after stain and first pu sealer coat.
Then we use a medical syringe to fill the pore with sealer, and have to wait several hours to sand it.
After we sand the bare wood, we are using filler, but those defects are difficult to see.
What can we do to avoid this, or to easily close this defect?
Thanks a lot.

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You can use a paste filler before finish coat which fills all the pores, but it is not quick. You basically cover the entire surface, let it dry and then sand to smooth before staining and finishing, but it eliminates the open pore situation. It is not quick, but permanently fixes the problem instead of going back and trying to fill open pores which if you are using catalyzed finishes that don't rewet are probably showing through the next coat.

Looks to me like a bad glue seam instead of wood pores. More careful handling and a better job of jointing the edge should eliminate a lot of that. I preferred Famowood solvent based for tiny imperfections.

Thank you very much Dan and Rich!
Dan, do you believe it I use a water based filler between the coats it will help?
Rich, We are using automotive filler, do you believe solvent famowood is better for the wood? I am going to check how our people are glueing th pieces.
Thanks

As said above, best practice for a full fill is to use a paste wood grain-filler. There are a number of these on the market. The one I am familiar with is either brushed or sprayed (reduced) to the raw wood, and wiped into the grain almost similar to wiping a stain. roughly 4 hr dry time, then sand back and seal. They can usually be tinted also, but once dry, they are clear.

I've attached a link to the product I'm familiar with below.

-Gary

ML Campbell FD Wood Filler Paste