A professional exterior painting expert will use a spray application for a smooth factory like finish.
Paint bottom edge siding.
Bottom of siding boards should not be caulked water is meant to exit through the bottom of each board.
Over time the siding can completely fail as in these examples.
Once all caulk is dry and your siding is clean you ll paint hardie plank with a high quality exterior grade acrylic latex.
Lp siding products also come in sheets in when water runs down the face of the siding it tends to hang on the bottom edge wicking up and causing the bottom edges to swell and delaminate.
The bottom edge of lp lap siding is where the failure is first evident.
Then make sure the coating is completely dry before applying the 2 nd coat.
I noticed some slight swelling and delamination on some of the boards on the north side.
Back brush by working the paint into cracks and onto the bottom edge of shingles and siding with your paintbrush.
The most vulnerable profile is the lap siding where water can cling to the drip edge and wick into the bottom edge of the siding as shown in the photo below.
Inner seal was sold as both lap siding and in panel like 4 x8 sheets with the t1 11 profile.
Also avoid caulking tongue and groove siding boards together.
While paint does tend to somewhat glue these pieces together caulking them is never advised and can cause permanent damage.
Once water starts to penetrate the drip edge the siding saturates swells and delaminates.
Paint from a bucket with 2 or 3 in.
Coat the top edge of the siding where it meets the top of the wall the bottom edge where it meets the foundation and all other areas that a larger brush will not reach such as into the overlaps between siding panels seams between sections and around doors and windows.