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Is Polyurethane Seam Sealant really Necessary?


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#1 welshy

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Posted 09 August 2006 - 11:47 AM

I have been searching through previous posts for the last couple of days but still don't have a definate answer to my question.

My list of panels to be replaced are:

Scuttle
A Panels
Outer Sills
Front Quarter Floor Pans
Both inner wings (back edge only as i am having a flip front)

I have removed my first outer sill and want to do a proper job so i went out bought some Waxoyl (which i was struggling to find until i found out my mate sells it £13 for 5 litres... bargain).

From the posts i have read, people are suggesting after removing surface rust from the area under the outer sill, to then coat it with a acid based etch primer (which i am struggling to buy locally), can i use any of the following primers (as i can get them cheap too)

http://1.1.1.1/52246...ctGuide2006.pdf

Once the acid based etch primer has dried i have then read to cover everything in seam sealant (something else i am struggling to get) and then i believe i am meant to waxoyl it all before and after welding the outer sill on.

This to me sounds like overkill especially as i am having difficulty sourcing seam sealant.

So my question is, if i can get acid based etch primer and waxoyl everything before and after can i forget the seam sealant?

If not where is the best place to buy seam sealant (and acid based etch primer) it in the leeds area and how much please?

Thanks in Advance
Welshy

#2 1984mini25

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Posted 09 August 2006 - 11:52 AM

I’ve always got my seam sealer from Halfords, thinks is grey stripe that I use, and I’m sure I’ve seen primer in there too.

#3 welshy

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Posted 09 August 2006 - 08:07 PM

I went to Halfords after work and found the grey strip seam sealer but it didn't say anything on the tin about it being polyurethene based.

I have been told i can get a two pack etch primer from work. Will this be suitable?

#4 Retro_10s

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Posted 09 August 2006 - 08:34 PM

be careful welding next to underseal... it can be like napalm if quite fresh.

#5 Woody

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Posted 10 August 2006 - 06:11 AM

DO NOT WAXOYLE BEFORE WELDING ! it is highly flamable !
but you must use "weld through primer "on all your bare metal edges before welding .

#6 Stoo

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Posted 10 August 2006 - 07:02 AM

Not tried this on my mini so don't know if it's possible. I blocked the drain holes on my MGB sills and drilled a few holes in the top. I then filled the sills to the top with hot waxoil (took about 8 litres) and then pullled the plugs and drained it. Reused the drained waxoil in the other side. You'll need to ensure drain holes are cleared properly afterwards. Considering how much bare metal was inside (no weld through primer used) it's still absolutely fine 8 yrs on :w00t:

May work on a mini - I will try it when I do my sills (I'm waiting for the oversills to apart first!)

#7 ceejam

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Posted 11 August 2006 - 09:20 AM

You do want to seal the seams. use zinc rich (weld through) primer on the inside of bits you can;t get to afterwards, use seam sealer on joints PU Seam Sealer this stuff looks a good price.

Then waxoyl the inside of box sections when you're finished welding.




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