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73-87 Chevy _ GMC Trucks => Body, Glass & Paint => Topic started by: txtj79 on January 15, 2008, 04:15:22 pm

Title: Self-etching primer?
Post by: txtj79 on January 15, 2008, 04:15:22 pm

What exactly is self etching primer?  Is it necessary, or will "non" self-etching primer work on these trucks?  What type of application requires self-etching primer?

Thanks,

T.J.

Title: Re: Self-etching primer?
Post by: Blazin on January 15, 2008, 05:52:26 pm

You can use Dupont 244S to etch bare metal and put any primer you like on. Self etching primer etches the metal for you. Think of it like wood stain on wood, it soaks in. self etching primer does this on a smaller scale. You should always have a good mechanical bond, it wont substitute for that. Most self etching primers do not have any filling or very little filling qualities. You should use a two or three part urethanebased primer over it.

Title: Re: Self-etching primer?
Post by: txtj79 on January 16, 2008, 09:02:45 pm

So the etcher is what makes up the mechanical bond?

Title: Re: Self-etching primer?
Post by: Blazin on January 17, 2008, 09:03:18 am

No a mechanical bond is the scratches that sand paper leaves behind. The etching is just another insurance to keep primer bonded to metal.