Etch Primer life

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Etch Primer life

This topic has 8 replies, 7 voices, and was last updated 8 December 2021 at 17:52 by Steviegtr.

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8 December 2021 at 11:35 #30186
Bob Unitt 1
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@bobunitt1
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8 December 2021 at 11:35 #574660
Bob Unitt 1
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@bobunitt1
Does anyone know how long Phoenix 2-part Etch Primer remains usable for brush application once mixed, if kept in a sealed container ? I tried emailing them with this question, but no response
8 December 2021 at 12:31 #574669
Robert Atkinson 2
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@robertatkinson2
Any 2 part paint is unlikely to keep for very long once mixed. Putting in the fridge will help. Some 2 part materials can be frozen once mixed to stop them curing. This is used for some ircraft sealants.

The Phoenix website says 3 hour pot life. Closing the lid will make no difference to this.

https://www.phoenix-paints.co.uk/products/60pq31

Robert G8RPI.
8 December 2021 at 13:22 #574673
Adrian R2
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@adrianr2
On Youtube you can find a video from "Trev's blog" where he shows how to carefully weigh out and mix small quantities of 2 pack paint – OK that is automotive small, not model engineering small, but may still be helpful.
8 December 2021 at 13:24 #574674
Martin Kyte
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@martinkyte99762
One year if I remember correctly.

regards Martin
8 December 2021 at 14:33 #574679
Bob Unitt 1
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@bobunitt1
Posted by Robert Atkinson 2 on 08/12/2021 12:31:49:

Any 2 part paint is unlikely to keep for very long once mixed. Putting in the fridge will help. Some 2 part materials can be frozen once mixed to stop them curing. This is used for some ircraft sealants.

The Phoenix website says 3 hour pot life. Closing the lid will make no difference to this.

Robert G8RPI.

I thought that time-limit was just for spraying ? I know the 1-part primer is good for a month before it loses the ability to etch, and was wondering if the 2-part is just the components of the 1-part in a form which will last longer until mixed ?

Edited By Bob Unitt 1 on 08/12/2021 14:36:38
8 December 2021 at 14:50 #574681
Oldiron
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@oldiron
Posted by Martin Kyte on 08/12/2021 13:24:30:

One year if I remember correctly.

regards Martin

Only when unmixed.

regards
8 December 2021 at 16:10 #574695
Dave Halford
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@davehalford22513
Posted by Bob Unitt 1 on 08/12/2021 14:33:05:

Posted by Robert Atkinson 2 on 08/12/2021 12:31:49:

Any 2 part paint is unlikely to keep for very long once mixed. Putting in the fridge will help. Some 2 part materials can be frozen once mixed to stop them curing. This is used for some ircraft sealants.

The Phoenix website says 3 hour pot life. Closing the lid will make no difference to this.

Robert G8RPI.

I thought that time-limit was just for spraying ? I know the 1-part primer is good for a month before it loses the ability to etch, and was wondering if the 2-part is just the components of the 1-part in a form which will last longer until mixed ?

Edited By Bob Unitt 1 on 08/12/2021 14:36:38

Bob,

Think of it as a car body filler, once you add the oxidizer hardener the result is only altered by temperature.

1-part is ordinary acrylic paint and dries mostly by solvent evaporation.

2-part requires the hardener to be added to effect 'drying' and based on isocyanates it's very nasty to breathe.

The etch action is an entirely separate to the drying process
8 December 2021 at 17:52 #574710
Steviegtr
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@steviegtr
I think here the general rule is, only mix what you need. There is no need to mix the whole tin. I use 2 part products a lot. Fibre glass resin. Primers, & clear coat. I try & work out how much i need & then just mix a little more.

Steve.
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