While paint does tend to somewhat glue these pieces together caulking them is never advised and can cause permanent damage.
Paint bottom edge siding.
Inner seal was sold as both lap siding and in panel like 4 x8 sheets with the t1 11 profile.
Bottom of siding boards should not be caulked water is meant to exit through the bottom of each board.
Also avoid caulking tongue and groove siding boards together.
Once water starts to penetrate the drip edge the siding saturates swells and delaminates.
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.
Of paint in the bottom rather than a full can of paint.
Once all caulk is dry and your siding is clean you ll paint hardie plank with a high quality exterior grade acrylic latex.
Then make sure the coating is completely dry before applying the 2 nd coat.
Back brush by working the paint into cracks and onto the bottom edge of shingles and siding with your paintbrush.
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.
How to paint hardboard siding bottom edge only my 24yo house seems to have hardboard siding.
A professional exterior painting expert will use a spray application for a smooth factory like finish.
The bottom edge of lp lap siding is where the failure is first evident.
Then brush with the grain of the wood to smooth the paint.
Paint from a bucket with 2 or 3 in.