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Forum topic by woodlog posted 08-02-2013 09:52 AM 976 views 0 times favorited 4 replies Add to Favorites Watch
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2 posts in 2001 days

08-02-2013 09:52 AM

Topic tags/keywords: pine

Good morning, I have a question that perhaps somebody could give me an answer or direction.

I built a log siding cabin in Northern Maine, I used a 10” log siding (white pine) 3 1/2” thick. On a 3’ long log I divided the length into 10 different sections and applied Minwax Polyshade (honey) to each section (different # of coats) and then covered it with Hellsman Spar Urethene (again different # of coats) to each section. I put the test log face up on the ground and exposed to the elements (of Northern Main) (snow,ice,sun,rain etc) for 3 years. The test was a sucess, it held very well better than I thought.

I am going to spray the Hellsman Spar Urethene on the siding and the question is: How much thinning (in %) should I do?

Any help would be appreciated. Thanks all for your patience.

4 replies so far

View rrww's profile


263 posts in 2354 days

#1 posted 08-02-2013 01:06 PM

I have sprayed it once with a 1.4 tip HVLP. It was no fun.

Oils are tough to spray and don’t flow out and stick like solvents. It will run like mad if you put more than a mist of it on. I thinned several ways but I made it work at 15% with very very light coats – with that being said the type of gun, and tip size will have a lot to do with it, you will have to experiment with your setup.

If it was me – I’m handy with my spray gun, but I would be getting my brush out for this project. By the time you lightly mist several (depending on how many “regular” coats you want) coats you will have more time in spraying, then just brushing. This isn’t the cheapest finish in the world, and by lightly misting several coats (remeber overspray) you are wasting a great deal more than just brushing.

If you get it to work better than me, let me know how you did it!

View woodlog's profile


2 posts in 2001 days

#2 posted 08-04-2013 12:51 PM

Thank you for your reply, I am going to spray because it is the easiest way for a 71 year old man to do. I have over 3300 linear feet to poly, includes gable ends of 23 feet in height.

What I am looking for is the % of dilution, I will try your 15% and see how that works.

I have brushed Hellsman Spar for years on my boats (I live in FL and summer in Maine) and have had excellent results.

The Minwax folks were of no help, even that they sell a spray can and it has to be diluted or formulated in a way to spray, but they did not come to my rescue at all.

View Shawn Masterson's profile

Shawn Masterson

1325 posts in 2189 days

#3 posted 08-04-2013 02:19 PM

I use the HF hvlp sprayer. I have not needed to thin poly. Is helmsman thicker than reg oil based poly? in my experience I only thin as much as I have too, to allow the material to flow.

View gfadvm's profile


14940 posts in 2931 days

#4 posted 08-05-2013 02:14 AM

I have sprayed a lot of Helmsman Spar from MW with my cheapo Home Depot spray gun. I have never diluted it at all and spray at 50 psi. Practice on a big piece of cardboard til you get your gun adjusted properly. This stuff dries much faster when sprayed and I’ll do a second coat as soon as the first is tacky. And no runs.

I can’t tell you the size of my tip but it is the one that came on the HD gun.

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

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