Caulk any joint that allows this to happen.
How to seal pine siding.
If the boards will not take abuse consider finishing the bare wood with old fashioned paste wax for wood.
Like all other finishes it slightly enhances the natural pigment in pine.
Then caulk all joints with a high grade 50 year paintable silicone or polyurethane product to prevent water from getting behind the siding.
I would like to clean it before sealing it but not remove the red color.
Sorry gary just found your question.
There is no hard finish and water and stain resistance is low.
If you re going to air seal the siding with broadsheet goods like housewrap don t cut it into strips caulk them.
Before applying your finish thin a small amount of polyurethane with mineral spirits in a 2 1 dilution ratio.
Using an acrylic latex polyurethane you can seal your tongue and groove pine paneling with a foam paint roller brush or paint pad.
Yes it really works and is easy to apply.
Dip a paintbrush in the sealant and apply it to your object s surface in long strokes.
The sealant helps the finish stick better to the pine and last longer.
Tinting a standard white primer a shade or two lighter than the finish coat improves coverage.
Apply stain after after sanding the wood and before applying shellac.
However the result is a soft sheen with most of the original color remaining.
To remove the stain clean with a solution of oxalic acid dissolved in warm water.
I recently had a coffee table made from painted barn wood siding by amish friends.
What do you suggest i use.
On jan 21 2019.
Seal the surface with diluted polyurethane.
Lay the siding out on sawhorses or on a horizontal surface to make applying the sealer easier.
Avoid splashing the mixture onto adjacent surfaces.
Wait until the knots are sealed before priming and.
Apply the stain to the front of the board before sealing the back and edges and then let it dry.
Instead start the edge by stapling the sheet to the interior face of a stud then tuck it to the sheathing and side staple it to the side of the stud move across the bay to the other sheating stud corner and staple it there then wrap the stud side stapling it to the to other side of the stud etc.
Seal stained wood with two coats of polyurethane.
Wear eye protection and acid proof gloves.
Using a standard sized roller instead of a short roller speeds the process of applying the sealer.