I would suggest famowood as it shrinks the least and have a good selection of colours.
Filling nail holes 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.
Filling nail holes nail holes in interior walls can generally be filled with shrink free spackling by overfilling the hole slightly then sanding smooth once it s dry.
1 the installation guide for hardie board which is a brand of cement board siding recommends using caulking to fill nail holes.
Work the putty down into the holes and smear the putty over the top and edges of the defect.
The best filler for your siding is a two part epoxy product that cures to a rock hard consistency.
Epoxy putty is a commonly recommended wood filler for use in repairing woodpecker damage.
When i ve installed it i used a high quality exterior paintable calking after smoothing the edge of the holes.
Wood fillers are typically formulated for one or more specific tasks.
Clean the hole or depression you plan to fill.
Use a putty knife to force the filler inside the hole making sure to fill in the hole and to completely cover the opening.
Once the caulk is dry you can touch up the paint.
Some are suitable for filling voids such as divots holes or gouges in.
Nail holes in exterior surfaces just as with cracks or gaps can be dealt with using a good caulking.
Wood filler can be used for small holes dents etc.
Clear paintable caulking can be used on cracks gaps.
Roughen the area you want to patch with 80 grit sandpaper for a better bond.
To patch holes and depressions in siding of any kind follow these steps.
Fill the siding holes with wood filler.
Holes in wood trim are best filled with wood filler.
As you are dealing with different problems different solutions will be required or a combination of solutions.
Scrape away any excess with the putty knife when you re done and allow it to air dry.