Find the entrances mice use to enter your home.
Seal small space between wooden siding.
Cover as much of the wood as you can with sealant using a small brush to get into the spaces between panels if the siding is already installed.
Sealing for natural weathering.
The proper approach to this is to install vertical strips of wood over the cracks from the outside.
Use latex painter s caulk inside of doors and windows or to quickly fill cracks and holes in drywall.
It will look like crap and on top of that like you already indicated it will be hard to put in there in the first place.
Crawl around the exterior of your home and use a flashlight to find cracks holes and gaps.
Use to install wood paneling without nails.
Seal a door frame in place and seal the subfloor at the bottom of a door frame.
Correctly sized backer rod a bond breaker and properly applied sealant is the appropriate way to handle the joint between dissimilar materials with different coefficients of expansion both thermal and moisture such as wood trim and cement plaster.
Smooth the caulk bead with your finger and begin caulking the joint between the fascia board and the soffit also known as the eave.
Leaving your cedar exposed to the elements for weathering can damage the cedar especially in excessively wet climates.
Slowly move down the joint to apply a steady bead of caulk into.
Use a small.
You can choose to use something like 1x2 inch cedar strips.
Do not try to use caulk between all the boards.
Think of a wood home as a living thing.
The siding expands and contracts with temperature and humidity.
Fill in gaps between crown moulding and baseboards.
It needs to move and breathe.
While my experience is more with vinyl siding sealing the siding to the foundation would deny any moisture that developed behind the siding from driving rain between seams in the siding condensation behind the siding ect an exit at the bottom.
Look under the siding at the area meeting the foundation of your home for holes and gaps.
I would be hesitant to seal the siding to the foundation.
If you prefer weathered cedar s grey color but want a more uniform color than what comes naturally you can seal the cedar using bleaching oils.