"Robert11" wrote in message
Have heard about, but have never used the Macco Liquid Nail
product.

How does this product compare to, e.g., an epoxy ?

Different products for different uses. Eposy is a two part chemical, LN is
one part.



Where would it be preferable to an epoxy ?

Construction, rough surfaces



Does it set up hard, or semi-flexible ?

Depends on the type.



Pros and cons, etc. ?

Depends on the application. LN is a mostly construction product, good for
paneling, framing, furring strips, flooring, etc. Epoxy is a more precise
product but there are many variations also. It generally applies thinner,
has some gap filling properties.