Underseal / Expoy primer reacted with seam sealer. Help

[Laurence B]

Alright so basically i'm in the process of restoring my nissan 200sx as it was pretty rotten.

Once I'd finished the drivers side arch I decided to underseal it so that I could run all the wiring loom instead of having to wait till all the car was done.

I seam sealed all seams with Sikaflex 221 (applied onto bare metal) Then gave it 2 coats of Bilt Hamber Electrox primer then 2 coats of 3M schutz underseal.

That was around a month ago, last week I actually got round to doing the wiring having not gone near the arch since spraying it.

I noticed that the seam sealed areas were sticky and don't seem to have dried as I can rub the primer/underseal off to reveal the sealer.

So is there any reason why it could've reacted?

Thanks in advance,

Laurence

 

[anjum]

The Bilt hamber is not an epoxy primer just a zinc rich primer. Might be self-etching at a guess, which may be the problem.

As another point, I find it's better to paint first then seam seal, then paint on top of the seam sealer.

 

[Laurence B]

Yeah sorry just realised i'd put epoxy in the title I meant electrox was in a bit of a rush writing everything. So I should've primed, sealed, primed then undersealed?

Wish i'd asked on here first really just found a thread on a forum i'm on and he seemed to get good results so just followed what he'd done.

Atleast I haven't done the whole car and just one arch!

 

[langy]

Yeah sorry just realised i'd put epoxy in the title I meant electrox was in a bit of a rush writing everything. So I should've primed, sealed, primed then undersealed?

Wish i'd asked on here first really just found a thread on a forum i'm on and he seemed to get good results so just followed what he'd done.

Atleast I haven't done the whole car and just one arch!

Yes you should of primed then sealed it, Epoxy would have been miles better.

 

[anjum]

Not too late, have a look at the guides on rust.co.uk

 

[Laurence B]

Is the reason it's reacted / stayed sticky because I didn't prime it first? Can't find any guides on rust.co.uk Does anyone have a decent guide for seam sealing,priming then underseal ? I've got a basic compressor setup so don't mind gunning schutz on but would rather do with primer out of cans.

Cheers,

Laurence

 

[anjum]

You can paint the epoxy on with a paint brush if your going to cover it in underseal anyway. Saves on thinners as well!!

No idea why the previous paint didn't set properly as I've got no experience with zinc rich paints.

 

[Laurence B]

Ah right, Well i'm gonna paint the other arch and see if there's a problem with it as it was quite cold when i did the first arch so it may not have set properly

 

[keithski122]

Did you smooth out the sealer with thinners?
I've done this and found the sealer is still sticky a few days after.