Will PB Blaster or WD-40 negatively impact a cylinder bore?

[c1j1miller at netscape.net (Chris Miller)]

I'd use a true penetrating oil to free the rings; I like Kroil. 
 Afterwards, use WD-40 to keep the cylinder walls free of rust until 
you're ready to finish the rebuild.  WD=water displacing; IMO works best 
to coat/protect metal or as a light lubricant, not as a rust remover.

Chris
'81 Scirocco
Bolton, MA

jtoomasson@yahoo.com wrote:

>I'm going to be cracking into my stuck ABA soon and since I won't have the head on it, I was wondering if I could use any of the known "break-free"/penetrating lubes to assist loosening the pistons from the cylinder bores without harming any internals.
>
>My hope is to not have to rebuild the block if at all possible.
>
>Thanks, JT
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