Mixing two pot paint

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LeonF

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I have 5 litre tins of Jotun two pot undercoat and paint, and I only need half a tin at a time. To get an accurate mix can I use one of those plastic kitchen measuring jugs, or will the solvent melt the plastic kind ? The glass ones are expensive. How would you guys suggest I go about it ?
 
LeonF said:
I have 5 litre tins of Jotun two pot undercoat and paint, and I only need half a tin at a time. To get an accurate mix can I use one of those plastic kitchen measuring jugs, or will the solvent melt the plastic kind ? The glass ones are expensive. How would you guys suggest I go about it ?
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Polythene or polypropylene are unlikely to be affected but exactly what paints are you talking about and what solvents do the safety data sheets say they contain?

Do the product data sheets make any suggestions as to suitable vessels for measuring and mixing small quantities?
 
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I did something similar last year when working with Penguard PB primer. Only used the plastic jars for measuring though and poured the mix into an empty paint tin. No problems.
 
I've mixed a tiny amount of Epifanes 2-pack using a couple of cheap plastic syringes and they were fine. For the time each components was in each syringe, there was no problem at all.
 
For less than €1 you can buy a proper mixing cup in which you can mix the quantity that you want at whatever mixing ratio. They are transparent and have markings on the outside. After mixing thoroughly pour it out into your paint tray. The residue in the cup will be hard enough by the next day, enough to let you peel it off leaving a pristine cup ready to be used again if you don't want to throw it away.

Here is one example; there are countless others.

finixacup.jpg
 
LeonF said:
Vic here is the paint data sheet, Hardtop XP. https://www.smlmarinepaints.co.uk/files/library/files/SAFETY_SHEETS/Hardtop_XP_comp_a_safety.pdf. I think the solvent might be xylene ? and Penguard HB https://www.smlmarinepaints.co.uk/files/library/files/SAFETY_SHEETS/Penguard_HB_comp_a_safety.pdf
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Both PE and PP may suffer some effects from some of the constituents but probably not of concern in the short time involved.

I'd do as 2nd Apprentice says measure with a PE or PP jug, one reserved for each component, and mix in a tin can
 
Syringes are great for small quantities like touching up.
You have to find out the mix ratio by volume, the ratio by weight is a bit different, at least for International.
I've used syringes for Int Perfection over a couple of weeks with no issues.

Jugs tend to lose quite a bit due to what remains after pouring.
 
i use two stainless desert spoons. plenty big enough for my needs as the epoxy primer i use goes off in about ten minutes. they clean up ok and can still be used for desert.
but then i dont have a mrs to moan at me.
 
Avocet said:
I've mixed a tiny amount of Epifanes 2-pack using a couple of cheap plastic syringes and they were fine. For the time each components was in each syringe, there was no problem at all.
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lw395 said:
Syringes are great for small quantities like touching up.
You have to find out the mix ratio by volume, the ratio by weight is a bit different, at least for International.
I've used syringes for Int Perfection over a couple of weeks with no issues.

Jugs tend to lose quite a bit due to what remains after pouring.
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viago said:
i use two stainless desert spoons. plenty big enough for my needs as the epoxy primer i use goes off in about ten minutes. they clean up ok and can still be used for desert.
but then i dont have a mrs to moan at me.
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Syringes and spoons may be good, esp syringes, for very small quantities but the OP is asking about mixing half a tin full at a time!
 
7 squirts of a 50cc syringe is about half a can.
Even a 25cc syringe is reasonable.
But I use all sorts of sizes, there is a good range on eBay usually.
I find pouring from a paint can into a jug messy, and unlike normal paint, 2 pack stays sticky for ages.
And it's easy to leave about a quid's worth in the jug!
 
lw395 said:
7 squirts of a 50cc syringe is about half a can.
Even a 25cc syringe is reasonable.
But I use all sorts of sizes, there is a good range on eBay usually.
I find pouring from a paint can into a jug messy, and unlike normal paint, 2 pack stays sticky for ages.
And it's easy to leave about a quid's worth in the jug!
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The OP is talking about half of 5 litre cans

I suspect thats rather more than 7 squirts of a 50cm³ syringe.
 
Rigger Mortice said:
??? Not if you are mixing the paint in the jug.
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I still cannot understand the apparent reluctance to use the 'proper' mixing cups, which have the added convenience of clearly marked mixing ratios. Compared to the cost of two-component paints the added cost of mixing cups is negligible, even if one religiously throws them away after a single use - something that is totally unnecessary, IMHO.
 
PuffTheMagicDragon said:
I still cannot understand the apparent reluctance to use the 'proper' mixing cups, which have the added convenience of clearly marked mixing ratios. Compared to the cost of two-component paints the added cost of mixing cups is negligible, even if one religiously throws them away after a single use - something that is totally unnecessary, IMHO.
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I don't use them because they're not available around here otherwise I would.
 
PuffTheMagicDragon said:
I still cannot understand the apparent reluctance to use the 'proper' mixing cups, which have the added convenience of clearly marked mixing ratios. Compared to the cost of two-component paints the added cost of mixing cups is negligible, even if one religiously throws them away after a single use - something that is totally unnecessary, IMHO.
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Some of these paints are very thick, it's hard to get the level exact in a mixing cup, so for smaller amounts errors can creep in.
I've found being as accurate as possible gives better results.
I've always got syringes on hand for epoxy work.
Also syringes avoid the need for pouring from the cans. Which risks contaminating the paint.

Mixing by weight is a good option, I have some digital scales which go in a poly bag when weighing sticky stuff.
 
I have just finished painting my seats on my boat in hempels two pack,I used a cut down milk container... 8 of the white to one of the hardener..simples
 
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