How to store finish

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Forum topic by Eric posted 05-30-2012 01:49 AM 1576 views 0 times favorited 21 replies Add to Favorites Watch
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216 posts in 1935 days

05-30-2012 01:49 AM

Topic tags/keywords: spar finish dry storage store

Recently I’ve been using Spar finish. On the second use from can #1 I noticed some clumps. I returned the can thinking it was a dud.

The same thing happened with can #2. After using most of the can (leaving a considerable amount of air space in the can), I checked the can after about one week of sit time. Sure enough the remaining finish had a dried membrane on top.

Yes I sealed the can lid with a mallet each time.

Is spar finsih susceptible to this? How do you fight against it?

-- Eric

21 replies so far

View a1Jim's profile


115177 posts in 3001 days

#1 posted 05-30-2012 01:58 AM

Usually finishes say to store them in a cool dry place. the other thing I do is buy my material in quart containers even though they cost more than gallons but last longer. There’s also a product that you spray in the can just before closing the can that replaces the air that helps preserve the finish.

-- Custom furniture

View gfadvm's profile


14932 posts in 2114 days

#2 posted 05-30-2012 02:03 AM

I have the same problem with Spar Urethane. I have even poured it into glass jars, filling them to eliminate air space and a few weeks later it has turned to gel/goo. The Bloxygen Jim cited works pretty well but is pricey and I hate paying for something that feels like an empty spray can!

-- " I'll try to be nicer, if you'll try to be smarter" gfadvm

View patron's profile


13524 posts in 2765 days

#3 posted 05-30-2012 02:22 AM

try this

more here

-- david - only thru kindness can this world be whole . If we don't succeed we run the risk of failure. Dan Quayle

View Loren's profile (online now)


8178 posts in 3072 days

#4 posted 05-30-2012 02:48 AM

exhale into the can and then seal it fast.

View Sarit's profile


514 posts in 2564 days

#5 posted 05-30-2012 04:39 AM

I think you can put some plastic wrap directly on the surface of the liquid making sure there are no air bubbles.

View Fuzzy's profile


297 posts in 3412 days

#6 posted 05-30-2012 02:31 PM

I place the UNLIT tip of a Propane Torch into the container and open the valve for several seconds … Propane is heavier than air, so it will displace it. Much cheaper than commercial blockers, and it seems to work. OTOH … exhaling into the can is even more economical, so if it works … why not ???

I’ve also heard of placing discs of Saran Wrap or waxed paper on the surface, but have you to try it … sounds like it should work … ANYTHING to keep Oxygen from contact with the finish.

BE SURE to never return finish to the container that has been out in the open … it will cause the exact same effect.

-- - dabbling in sarcasm is foolish … if you’re not proficient at it, you end up looking stupid … ... ...

View KarenW's profile


131 posts in 1612 days

#7 posted 05-31-2012 10:09 PM

I also exhale a big breath into the can and seal it quick. Never had anything skim over when I do that.

-- Happiness does not come from doing easy work but from the afterglow of satisfaction that comes after the achievement of a difficult task that demanded our best. --Theodore I. Rubin

View Eric's profile


216 posts in 1935 days

#8 posted 05-31-2012 10:19 PM

Wow. Thanks everyone. I just bought my next quart of spar today. I think I will try the exhale method first. You can’t beat the price!

-- Eric

View fredf's profile


495 posts in 3134 days

#9 posted 06-01-2012 02:43 AM

I’ve tried dustoff (canned air for cleaning computers) (which is r134 in most cases). it seems to work ok too, although haven’t and a lot of experience with it.

-- Fred, Springfield, Ma

View thedude50's profile


3596 posts in 1902 days

#10 posted 06-02-2012 01:15 AM

I too use my propane torch to preserve the spar varnish sorry I forgot to tell you to do this eric My buts the product jim recommends is inert and not flammable therefore it is the preferred method to preserve the stuff. I hardly ever have a can for more than a few days. I always buy the smaller containers to be sure they stay fresh I have never tried exhaling but if that works I would stick with that it is cheep. you know these guys should tell you to buy beloxigen when they sell you a gallon of spar varnish.

-- Please check out my new stores and

View Grandpa's profile


3256 posts in 2100 days

#11 posted 06-02-2012 03:19 AM

Anyone ever try mixing vinegar and soda in a pitcher then pouring the gas (not the liquid) into the container and placing the lid on it? I saw where a guy got money for this suggestion but have never tried it myself. Just wondering.

View fredf's profile


495 posts in 3134 days

#12 posted 06-02-2012 10:41 PM

Grandpa—that should work even better than exhaling into the can, pure co2! If co2 works ok a co2 cylinder with regulator would make it really easy too.

-- Fred, Springfield, Ma

View RussellAP's profile


3059 posts in 1711 days

#13 posted 06-03-2012 12:14 AM

I use Rustolium quart size ultimate spar, and never had this problem. In fact I’ll pour what I don’t use in my sprayer back in the can and still no problem. And yes I use a filter.

-- A positive attitude will take you much further than positive thinking ever will.

View UncleStumpy's profile


707 posts in 1737 days

#14 posted 06-03-2012 08:20 AM

Guys, just store the container upside down. The skin will form on the bottom where there is air.
Sometimes opening up the can the next time might be a little tougher but, no skin.

-- "They don't want it perfect - they want it SPECIAL"

View Clint Searl's profile

Clint Searl

1533 posts in 1785 days

#15 posted 06-03-2012 08:38 AM

Oil based finishes can be stored in the freezer to retard polymerization.

-- Clint Searl....Ya can no more do what ya don't know how than ya can git back from where ya ain't been

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