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 Post subject: Zinsser Allcoat
PostPosted: Tue Jul 17, 2018 6:49 pm 
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Hi
Need to paint my wooden fascias, a couple of back wooden windows and galvanised garage door.
All last painted a few years ago so will need to sand back to wood/metal in parts due the old flakey paint.

Have my final paint Sandtex Chestnut brown for wood and some Wickes Magnolia 5 year external gloss for garage door.

Was thinking of using some Zinsser BIN, I have spare on the bare patches of wood and metal.

Then using Zinsser Allcoat (white) to under coat both wood and garage doors, before the topcoat.

Would this work?

Thinking this way due to drying/coating time, and speed/cost of using one pot for all undercoat.

Or should i buy the sandtex gloss undercoat and garage door gloss undercoat?

Any recommendations
Thanks


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 Post subject: Re: Zinsser Allcoat
PostPosted: Tue Jul 17, 2018 7:09 pm 
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BIN is quite brittle and not ideal for outsides, just for knotting or spot priming. Allcoat is self priming so you don't need to worry.
My experience is if there's any movement get something flexible, I don't consider Allcoat flexible IMO.


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 Post subject: Re: Zinsser Allcoat
PostPosted: Tue Jul 17, 2018 8:07 pm 
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If you're using magnolia gloss on your garage door then get some Johnstone's stormshield flexible undercoat in white. Spot prime any bare metal with Zinsser 123. White allcoat under chestnut brown gloss won't work, you need a darker undercoat. You can get stormshield dark grey undercoat to go under your chestnut brown gloss for the woodwork.


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 Post subject: Re: Zinsser Allcoat
PostPosted: Tue Jul 17, 2018 8:49 pm 
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I always thought BIN was only for spot priming outside.

Bedec barn paint is another one to consider.


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 Post subject: Re: Zinsser Allcoat
PostPosted: Tue Jul 17, 2018 9:13 pm 
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Thanks for replies, popped in Wickes just before it shut. Got some dark grey Sandtex 10yr primer undercoat (flexible), 750ml . £14.87 in latest offer.
Unsure about garage doors, does the paint need to be flexible?
Can I spot prime with BIN, have no 123?
Then use Allcoat or flexible undercoat

Read good stuff about Allcoat, just fancied using it, but if its wrong then no point.

Thanks


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 Post subject: Re: Zinsser Allcoat
PostPosted: Tue Jul 17, 2018 9:39 pm 
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You can spot prime with BIN but 123 is the daddy for using on bare galvanised steel. Allcoat is brilliant stuff but it's a one paint system and certainly not designed to use as an undercoat under oil based gloss, you can take a chance with it and you might be ok.


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 Post subject: Re: Zinsser Allcoat
PostPosted: Wed Jul 18, 2018 7:54 am 
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You don't need the 123 on the metal or galv, it's the same bonding resin in Allcoat which also sticks to metal and galv.

With the flex - I'm sure it's fine , just got a bit paranoid lately but that's with wood so ignore that.



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 Post subject: Re: Zinsser Allcoat
PostPosted: Wed Jul 18, 2018 8:46 am 
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I have Allcoat on my garage door, doing well with no flaking or cracking. I did have to do some touch ups this year due to rust spots, my fault though for poor preparation in those areas.


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 Post subject: Re: Zinsser Allcoat
PostPosted: Wed Jul 18, 2018 8:46 am 
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Good point Des, We did a load of weathered galv in allcoat years ago and it held up fine, I think Zinsser say to use the 123 on new galv as a primer.



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 Post subject: Re: Zinsser Allcoat
PostPosted: Wed Jul 18, 2018 6:02 pm 
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I've just been back to a house where I did a the garage doors with Allcoat. The bottom half was stripped and top sanded. The Allcoat is cracking up on the top half not the bottom.

Customer is fine as I recommended stripping it fully but she was happy to just tidy up.

It feels like the Allcoat grabs so tight that it affects the paints underneath so if they are on their last years it slowly pulls em off.

Wish I'd stripped it all now.


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