On Mon, 31 Aug 2015 12:17:27 -0400, Bob wrote:

Hello,

Have a typical Colonial with horiz. wooden siding.
The typical.

Needs a paint job, but not sure how this would be handled.

About, perhaps, 5% to 10 % of the paint is peeling.

O.K., I can certainly have that amount sanded down, and feathered prior
to any new paint.

But, any new paint only relies on the paint already down for adhesion I
would think. The new paint would only see what it is painted on; the old
paint.

The new paint never sees the actual wood underneath (except for the
small amount sanded down).

So, how does one ensure that the new paint will also not peel away as
soon as the old stuff probably will ?

Can't sand it all, way too much.

How is a situation like this handled ?
What am I missing ?

Thanks,

Bob,

Check this:

"A non-sudsing powdered Trisodium Phosphate (TSP) compound that is
formulated for heavy duty cleaning. Preferred by painting and cleaning
professionals for removing heavy deposits of greasy grime, smoke, soot
stains and chalked paint from walls, woodwork and floors. Removes
mildew and mildew stains when mixed with bleach. Cleans and prepares
surfaces for repainting. Also recommended for washing away paint
remover sludge.

Trisodium phosphate has been used by painters for years and years as a
heavy duty degreaser and all purpose cleaner. TSP is formulated for
removing Grease, soot,and lead paint dust cleanup. A washing of
surfaces prior to painting helps insure a good clean "bite" for the
finish coats of paint."

http://www.jamestowndistributors.com/userportal/show_product.do?pid=3808

HD has it in the paint section.