SW Extreme Bond an old oil base.

fffrank said:

First time using Sherwin Williams Extreme Bond bonding primer.
On the job there is -
some newer oil base,
some plasticky trim of unknown composition,
some metal doors with some kind of factory finish,
and some old oil base trim.

The Extreme bond sticks to everything without sanding, quite tenaciously.
Except the older oil base. It needs sanding.
My preference is to make sure things adhere without sanding, then sand just for some additional insurance.
If something doesn't stick without sanding, it makes me a little nervous, even if I'm going to sand. I'm currently sanding the ever-loving bejeezus out of the older oil-base, but I'm wondering what's going on.
Is it the nature of oil, to get more resistant to adhesion as it gets older, or is the SW bonding primer not up to snuff?

I cleaned everything with Dirtex (first time using it, too).

Caveat: I tested it shortly after drying, but it scratched off quite easily, when it didn't on any of the other substrates. I'll see tomorrow if it's improved with a little cure time.

Click to expand...

fffrank said:

First time using Sherwin Williams Extreme Bond bonding primer.
On the job there is -
some newer oil base,
some plasticky trim of unknown composition,
some metal doors with some kind of factory finish,
and some old oil base trim.

The Extreme bond sticks to everything without sanding, quite tenaciously.
Except the older oil base. It needs sanding.
My preference is to make sure things adhere without sanding, then sand just for some additional insurance.
If something doesn't stick without sanding, it makes me a little nervous, even if I'm going to sand. I'm currently sanding the ever-loving bejeezus out of the older oil-base, but I'm wondering what's going on.
Is it the nature of oil, to get more resistant to adhesion as it gets older, or is the SW bonding primer not up to snuff?

I cleaned everything with Dirtex (first time using it, too).

Caveat: I tested it shortly after drying, but it scratched off quite easily, when it didn't on any of the other substrates. I'll see tomorrow if it's improved with a little cure time.

Click to expand...

fffrank said:

First time using Sherwin Williams Extreme Bond bonding primer.
On the job there is -
some newer oil base,
some plasticky trim of unknown composition,
some metal doors with some kind of factory finish,
and some old oil base trim.

The Extreme bond sticks to everything without sanding, quite tenaciously.
Except the older oil base. It needs sanding.
My preference is to make sure things adhere without sanding, then sand just for some additional insurance.
If something doesn't stick without sanding, it makes me a little nervous, even if I'm going to sand. I'm currently sanding the ever-loving bejeezus out of the older oil-base, but I'm wondering what's going on.
Is it the nature of oil, to get more resistant to adhesion as it gets older, or is the SW bonding primer not up to snuff?

I cleaned everything with Dirtex (first time using it, too).

Caveat: I tested it shortly after drying, but it scratched off quite easily, when it didn't on any of the other substrates. I'll see tomorrow if it's improved with a little cure time.

Click to expand...