On Mar 8, 10:28*am, mkr5000 wrote:
I just want to see if others share this experience....

they say you shouldn't do it but I have had really good results with
spraying a light coat of polyurethane over my
painted surfaces.

I'm talking about aluminum parts which I have....

primed and dried well (a week or more) with canned rustoleum primer

painted with a good quality can spray paint (rustoleum -- krylon) and
let dry again, a week or more

sprayed a couple of light coats of the fast drying minwax spray can
satin polyurethane

It makes a huge difference in the ability to keep light scratches from
even appearing.

Anyone else? * -- *yet they say poly over paint is a big no no.

?

Have to agree with the other poster, Rustoleum isn't what I'd use on
objects that are getting a lot of mechanical wear, very soft stuff. I
use an epoxy or polyurethane paint for such things. The problem with
using poly varnish is that it usually doesn't bond very well with
paint under it. Sometimes it doesn't even bond very well with itself,
I've had gun stocks I was finishing have the last coat peel right off,
insufficient mechanical bonding. I don't use it now for such items.
For items that need the maximum protection, there's always automotive
two-part urethanes, with and without a clear-coat. Automotive stuff
is about the toughest finish you can get as a civilian.

For polished aluminum, there are clear lacquers which will give you
some scratch and ding resistance and still stick.

Stan