All Replies on Locus sign for farm

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View Mystang89's profile

Locus sign for farm

by Mystang89
posted 11-06-2017 02:21 PM

6 replies so far

View sras's profile


4970 posts in 3370 days

#1 posted 11-06-2017 03:48 PM

For outdoors, I use marine grade finishes.

-- Steve - Impatience is Expensive

View runswithscissors's profile


2928 posts in 2266 days

#2 posted 11-11-2017 02:04 AM

I suspect that if the wood was green, the moisture in the wood attracted the mold. Locust has a reputation as an extremely durable wood (though I don’t know about the sapwood in that regard).

Rather than trying to save the moldy sign, I’d dry the locust over several months before making your sign. The dry wood should give you much better results (even though it will get rained on, the mold problem shouldn’t be so severe.)

-- I admit to being an adrenaline junky; fortunately, I'm very easily frightened

View sawdustdad's profile


367 posts in 1126 days

#3 posted 11-11-2017 03:43 AM

Locust? Black Locust? They make fence posts out of locust. I just sold our old homestead. It has locust fence posts that I installed in 1981. Literally, 36 years ago. They are still solid as a rock. (At least the 5×5 gate posts are.) Many of the line posts only lasted 25 years. In direct ground contact, with no treatment.

So do you need a finish on a locust sign. I don’t think so.

-- Murphy's Carpentry Corollary #3: Half of all boards cut to a specific length will be too short.

View Mystang89's profile


3 posts in 443 days

#4 posted 11-11-2017 12:36 PM

The wood was cut down in late winter last year 2017 and has been covered from rain for about 3 months. I don’t know how long it takes to season because the sign is coming from a 6’ log shop maybe it takes much more time for it to season than a normal 2’ log? Either way it definitely has mold on it.

Yeah, it is black locus by the way. I had to rebuild a fence line and had a ton of it. I had just cut this one too short in my rush.

View Mystang89's profile


3 posts in 443 days

#5 posted 12-03-2017 03:00 PM

So I decided to just spar urethane water based. It says it’s superior uv protection, mold & mildew resistant and seals out water. It specifically states that it is for exterior use.

Today I went outside and there was coat on my sign so I wiped it off. It took some of the urethane with it! This is after 3 coats.

Sometimes PLEASE tell me what’s going on?!

View HerbC's profile


1792 posts in 3100 days

#6 posted 12-03-2017 03:48 PM

1. The slab of lumber is still “wet”, it will probably take a year or more to dry enough to be “finished” with any kind of coating or preservative. The polyurethane will not properly adhere to the surface of the wood due to the excess of moisture in the wood.

2. There is NO good solution that provides a transparent/clear coat for external use items. The closest thing that I’ve read of (haven’t tried myself…) is untinted exterior paint base (oil based)...

-- Herb, Florida - Here's why I close most messages with "Be Careful!"

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