Need to know type of saw and what size saw blade to use with the different types of hardi board, carbide tip, diamond tip etc. Need to also know if galvanized drywall screws are better than stainless screws that were sold to me for hardi board siding. What is the best way to paint - primer then what grade of paint. Oil vs water base???? I have a 1926 home built in Houston where it is hot and damp and moldy. Need guidance. Thank you.