Bonding turn signal fixture to damaged bumper

I recently hit a coyote at 80mph on a road trip with my 1997 Accord.
Amazingly, there was no major damage. However the impact tore out the
passenger side turn-signal assembly that normally screws into the
bumper. When I brought it to the mechanic he said, he wouldn't install
a replacement, as the bumper is cracked right next to the fixture hole
and the screw mounts are destroyed. He couldnt guarantee a new fixture
would stay in. So I have decided to buy a new fixture and epoxy the
top and bottom surfaces of the fixture into the hole in the bumper and
hope for the best. My concern is how the vibration from driving is
going to affect the plastic-to plastic bond. What would be the best
epoxy to create a vibration resistant bond in this application.
Would any 5-minute epoxy be sufficient?

Most two-part epoxies will NOT bond plastic. They say so right in the fine
print on the tube.

As a matter of fact, I mix my epoxies on plastic because it is easier to
clean up.

There is one two-part epoxy - manufactured by Devcon and sold under various
brand names - known as "Plastic Welder" that works well.

In article <01c7d2a1$6d8be200$ca91c3d8@race>, * > wrote:
>
>Most two-part epoxies will NOT bond plastic. They say so right in the fine
>print on the tube.

What is "Plastic?"

>As a matter of fact, I mix my epoxies on plastic because it is easier to
>clean up.

What kind of "plastic?"

>There is one two-part epoxy - manufactured by Devcon and sold under various
>brand names - known as "Plastic Welder" that works well.

The "Plastic Welder" I know of is not an epoxy at all but a solvent-type
adhesive. It works well on most thermosetting plastics, but not as well
as epoxy on phenolics.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

Scott Dorsey > wrote in article
>...
> In article <01c7d2a1$6d8be200$ca91c3d8@race>, * >
wrote:
> >
> >Most two-part epoxies will NOT bond plastic. They say so right in the
fine
> >print on the tube.
>
> What is "Plastic?"
>

Technically speaking, a "plastic" is anything that is capeble of being
molded. Steel can actually reach a plastic state.

In this situation, however, we are talking about a light assembly that is
cast from resins - which are generically referred to as "plastics".

The OP was questioning using epoxy for a "......plastic-to-plastic
bond....." on an automotive component.

You might want to read the OP. It will save you from asking such
embarassing questions.


> >As a matter of fact, I mix my epoxies on plastic because it is easier to
> >clean up.
>
> What kind of "plastic?"
>

A Polyethylene board that was originally sold to mix body filler on.


> >There is one two-part epoxy - manufactured by Devcon and sold under
various
> >brand names - known as "Plastic Welder" that works well.
>
> The "Plastic Welder" I know of is not an epoxy at all but a solvent-type
> adhesive. It works well on most thermosetting plastics, but not as well
> as epoxy on phenolics.

The "Plastic Welder" to which I refer is a two-part product manufactured by
Devcon and is referred to as an epoxy.

Why not Google "Devcon" and get all the answers you seek right from the
source?

I am not their spokesman.