The first is the possible and almost certain presence of lead based paint on the siding and the second is the asbestos in the siding itself.
How to prep old asbestos siding for paint.
Painting siding versus replacing what may prove to be a very expensive removal and or abatement which needs to disposed of properly and then new siding installed adds to the significant cost of replacement.
Allow the primer to dry completely.
Compared to other similar hardie board or fiber cement siding there is not much difference in terms of painting asbestos siding after you prepped and cleaned the surface.
Apply a coat of primer to the newly cleaned siding.
If work is to be carried out at height appropriate precautions must be taken to prevent the risk of falls.
Where paint is to be applied appropriate respiratory protection to control the paint vapours mist must also be considered.
Preparing the asbestos work area.
You can roll it or brush it on but make sure you get under the small lip at the bottom of each asbestos siding shingle.
Before starting assess the asbestos cement for damage.
Begin by analyzing a paint sample for lead content.
Preparation before coating is the key to a successful paint job.
It is your decision whether to paint or removal and replace remember it is always more affordable to paint old asbestos siding.
When you are done cleaning paint the siding with a suitable primer.
Besides the need to create a good surface for painting asbestos siding there are two other areas of concern.