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Old 09-11-2020, 11:28   #1
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Best way to preserve open cans of paint on board?

I am going to need to carry paint with me, because with a steel boat, I've found that no matter how well I prep, the paint will never stick to the primer absolutely perfectly and is prone to scuffs and scrapes. So I'm planning on touching it up as I go. Does anyone have any advice on how best to preserve the quality of open cans of paint on board? Does a Ziplock bag help? Maybe an airtight Tupperware container of some form? (This may also be good because I don't want any paint spills in my bilges). Should I be trying to store it in the area of the boat with the least temperature swings, if that's even possible?
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Old 09-11-2020, 12:01   #2
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Re: Best way to preserve open cans of paint on board?

Store the open cans upside down. Any tiny crack that would normally allow air in gets sealed with dry paint. Yeah, do make an allowance for your brother-in-law not tamping the top down with a rubber mallet before up-ending it.
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Old 09-11-2020, 12:09   #3
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Re: Best way to preserve open cans of paint on board?

I have found that aside from getting a nice tight seal on the open can, temperature is next biggest factor. Try to keep it between 60-85 F. And give it a shake every now and then.
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Old 09-11-2020, 12:10   #4
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Re: Best way to preserve open cans of paint on board?

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Originally Posted by tkeithlu View Post
Store the open cans upside down. Any tiny crack that would normally allow air in gets sealed with dry paint. Yeah, do make an allowance for your brother-in-law not tamping the top down with a rubber mallet before up-ending it.
Agreed, with one more step. cover the top of the can loosely with plastic wrap BEFORE putting the lid on. This keeps the lid from becoming a mess and makes it easier to get the lid on and off and for it to seal properly.

Also, try to keep the groove on the can clean. Thoroughly remove paint from the lip with a brush (as soon as you pour it), and give it a good wipe with a rag. If both the groove and the lid are always clean they will seal together properly.
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Old 09-11-2020, 17:25   #5
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Re: Best way to preserve open cans of paint on board?

Steel boat? Small air compressor and a needle gun will take care of surface prep
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Old 09-11-2020, 17:39   #6
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Re: Best way to preserve open cans of paint on board?

Poly drain pipe and fittings are your best friends when it comes to storing painting and glueing stuff.
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Old 10-11-2020, 09:31   #7
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Re: Best way to preserve open cans of paint on board?

This is what we use:
https://www.leevalley.com/en-ca/shop...e?item=53Z2101

It is also available in the US under a different name - just look for "Bloxygen"
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Old 10-11-2020, 10:02   #8
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Re: Best way to preserve open cans of paint on board?

Two-part polyurethane paints seem much more able to withstand extended storage in a partially-used can. I've learned to like 'em.
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Old 10-11-2020, 10:06   #9
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Re: Best way to preserve open cans of paint on board?

My best results have been to do the upside down thing. Make really, really sure the lid is on tight AND the can isn't stored where it might rust through. You can guess how I know and do the Bloxygen thing with one variation.

Last time I checked bloxygen was really expensive and I read on a wood working forum that you could buy a can of dust blower used for cleaning cameras, electronics and such. Seemed to work OK.
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Old 10-11-2020, 10:11   #10
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Re: Best way to preserve open cans of paint on board?

Quote:
Originally Posted by Shrew View Post
Agreed, with one more step. cover the top of the can loosely with plastic wrap BEFORE putting the lid on. This keeps the lid from becoming a mess and makes it easier to get the lid on and off and for it to seal properly.

Also, try to keep the groove on the can clean. Thoroughly remove paint from the lip with a brush (as soon as you pour it), and give it a good wipe with a rag. If both the groove and the lid are always clean they will seal together properly.

What Shrew said. He does what I do.


Later,
Dan
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Old 10-11-2020, 10:16   #11
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Re: Best way to preserve open cans of paint on board?

Learning from storing bottom paint that was purchased on sale a few months prior to use, I flip the paint every couple of weeks. As previously mentioned, it seals the top and keeps the paint from settling. But, metal cans are rust havens. Try to store in plastic containers with easy openers but have good UV protection.

I have spray cans that have rotted and blew its contents in a dock locker. Not pretty. Now, I take vaseline or some type of protectant to prevent rusting.
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Old 10-11-2020, 10:18   #12
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Re: Best way to preserve open cans of paint on board?

I fill the air space in the can with propane. It’s heavier than air so it displaces the oxygen in the can.
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Old 10-11-2020, 10:46   #13
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Re: Best way to preserve open cans of paint on board?

At home I use widemouth pint mason jars to store touch up paint. They are inexpensive, have an airtight seal, are easy to open even when there is paint on the sealing surface (just be sure there's none on the threads), and have a large enough opening to be easy to fill and to paint from with a 2" brush.


Aboard I would overpack them with a cardboard box or bubble wrap or something to guard against breakage.
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Old 10-11-2020, 12:03   #14
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Re: Best way to preserve open cans of paint on board?

Bloxygen - Inert Gas Preservative

www.bloxygen.com
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Old 10-11-2020, 13:44   #15
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Re: Best way to preserve open cans of paint on board?

Quote:
Originally Posted by Shrew View Post
Agreed, with one more step. cover the top of the can loosely with plastic wrap BEFORE putting the lid on. This keeps the lid from becoming a mess and makes it easier to get the lid on and off and for it to seal properly.

Also, try to keep the groove on the can clean. Thoroughly remove paint from the lip with a brush (as soon as you pour it), and give it a good wipe with a rag. If both the groove and the lid are always clean they will seal together properly.
To keep the groove on the can clean, I always pierce that groove a couple of times with a tiny screwdriver so that any paint, or varnish, or anything else, will
flow back into the container, helps keep down on that mess.
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