If the surfaces are dirty or covered with tree sap,
bird droppings, hand oils, etc., it's often better to
first wash them with a good product such as TSP, etc..
That stuff HAS to come off and sanding's the hardest
way to do it.
Can't find it now, but I have a can of stuff out in
the garage that'll cut just about anything off the
surface, plus claims to remove the need for sanding on
varnish & urethanes. I've used it with great success
so far (about 3 years). It removes the gloss in a
hurry, plus gets down into the little cracks and splits
that are impossible to "sand" into. Then you rinse it
with a hose, give it a day, and paint away.
Any bare spots of course need to be reprimed but
well-adhered paint should be OK to paint over. I often
prime even the well adhered paint so things like
happened on my back porch floor don't happen: Top
layer of paint coming off, exposing a slightly
different shade underneath it. I shoulda
cleaned/primed it better near the doorway where it's
Check around your local shops; it's nothing very
I was at the home depot and noticed a primer, Zinn(?) 1-2-3 that claimed
they are for "painted or varnished" surfaces. Any luck with them? I see
the benefit of the deglosser but that adds a step not needed if the primer
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