Simply apply this inexpensive filler into the cracks to seal.
How to seal cracks in cedar siding.
Repairing minor defects in cedar siding step 1 use a putty knife to apply exterior wood putty to smaller cracks or holes in siding.
Sand 3 inches past the end of the crack.
Refinish the siding if just the repaired portion needs refinishing apply a deep penetrating wood stain in the color of your choice.
Fill each crack with caulk then use a putty knife to scrape off the excess from around the edges.
After it sets examine the crack and if.
Paint works well over it.
If the entire exterior needs to be refinished wash all the siding down with wood surface cleaner.
Use long horizontal strokes with the block instead of short vertical strokes.
Seal small cracks and gaps in your siding under 1 4 inch wide using an acrylic latex caulk.
A full seal is important because any space that is missing sealant is more susceptible to water damage and chemical bleeding.
Wipe the wood with a damp cloth before the caulk sets.
Avoid polyurethane finishes as they can trap moisture below the surface of cedar.
This way you can completely seal the cedar front to back top to bottom and around all edges.