Prep for painting -- using a pressure washer

Is it safe to assume that whatever paint doesn't come off the siding with a high-pressure jet of water is OK to leave in place and paint over -- with primer first, of course?
Or does it still need a good scraping and/or wire-brushing?
Perce
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

It needs scraping. I just power-washed a wall. and only part of the loose paint came off. A ton more came off with the scraper.
If you use the power washer enough to get _all_ the loose paint off, you'll damage the wood.
Note: Wait a few days before priming to let the wood dry out.
--
Steve B.
New Life Home Improvement
  Click to see the full signature.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload


Absolutely ditto to what Steve said.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.