Seam Sealer question

[BimmerTim]

I feel like an idiot even having to ask this question.

I did body work at a VW dealer for several years, but I haven't even touched anything dealing with it in like 6 years.

Does seam sealer get applied before or after primer?

[Naplm00]

before

[Jand3rson]

Before, it uses the bare metal as a catalyst. Primer won't allow it to bond properly.

[BimmerTim]

Now I remember. You take the seam to bare metal and feather it out, then apply the seam sealer, then primer.

Thanks.

[Jand3rson]

Now I remember. You take the seam to bare metal and feather it out, then apply the seam sealer, then primer.

Thanks.

I used it on my car when I grafted my rear valance on. We mounted it with screws, welded a few sections every few inches, and then seam sealed the entire thing. I didn't worry about smoothing it out because it was going to be undercoated and then covered by the bumper.

[!kid]

Instead of making a new thread, I'll just asks hear still on topic.
Where do you guys buy seam sealer? any brands I should stay away from?

[Tha Driver]

I almost always epoxy prime (PPG DP primer) BEFORE applying the seam sealer. The epoxy will flow into the cracks & seal them better. It will also promote adhesion of the seam sealer.
Your local autobody supply will have seam sealer. Any good brand name should be fine. After applying I usually smooth it out with my fingers dipped in laquer thinner. Always epoxy prime over the seam sealer before painting.
I've been doing this sh*t for 40 years... :)
HTH,
~ Paul
aka "Tha Driver"