Paint tends to peel or flake near joints between dissimilar materials think siding and trim window frames and glass etc.
How to paint peeling wood siding.
Sanding filler caulking edges where trim meets another substrate allowing to dry.
Scrape sand and recoat these highly vulnerable areas as soon as peeling paint begins.
Instead the paint should be scraped off by hand using a paint scraping tool.
This is where water seeps into cracks and soaks into the wood causing the paint to peel.
However a four to five inch wide brush usually works best.
Unfinished siding exposed to several weeks of sunlight before painting needs to be sanded.
Heat from sunlight also drives the moisture into the wood.
To effectively apply primer use a paint brush and apply in a left to right right to left sweeping motion.
Sunlight degrades the unfinished wood surface thus it will never hold paint as well as fresh wood.
Once primer has dried trim is ready repainting exterior trim looking brand new.
2 complete coats of paint needed on wood to last.
Sand the cured filler with a hand sander to make it smooth and level with the surrounding wood.
Cutting digging out rotten wood before painting over old paint.
Sanding wood fillers before priming older paint coatings.
A very good high bonding primer on all bare wood surfaces.
Your brush size is dependent upon the size of your siding.
The high pressure of the sprayer can knock those old boards loose and infuse the bare areas of wood with water.
Priming all bare wood caulking fillers sealing trim allowing primer to properly dry.
Another key step preparing trim for paint is priming.
Step 4 paint your wooden clapboard siding.
Filling gouges with wood fillers on older surfaces.
Honestly this stuff is incredible.
Just look at the same trim after one coat of the primer and zero scraping or sanding.
Sills and other horizontal surfaces peel because water runoff is slow and in the meantime can work its way through any crack in the paint.