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