Personally i would not use a latex caulking on fiber cement.
Attaching hose bib to metal siding.
This video shows a unique and ez way to mark and cut out an electrical box hole in metal siding.
Then go outside and complete the hole by drilling through the siding.
Apply silicone caulk around the hole and attach the hose bib by driving two deck screws that are coated to resist rusting.
From the outside slip on the plastic gasket and push the hose bib through the hole.
Predrill a pilot hole for the screws with an 1 8 masonry bit.
Drive the appropriate screws through the screw holes and into the wall until they are snug.
Twist the connector on the reel s short hose to the hose bib and fasten the end of the garden hose to.
My main tool for perfection.
Most hooks are stainless steel so they won t corrode and they are easy to remove when you re done with them.
It slips into the groove between adjoining slats and once it clicks into place you can hang items as heavy as 12 pounds.
The easiest and safest way to hang something from vinyl siding is to use a siding hook.