Sealant for redwood and concrete

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Forum topic by Lumber2Sawdust posted 09-08-2010 05:19 AM 1262 views 0 times favorited 4 replies Add to Favorites Watch
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139 posts in 2829 days

09-08-2010 05:19 AM

I am working against the advancing seasons to finish building a shell of a greenhouse. This is a building attached to our detached garage (my workshop!) It is framed with redwood, and has reused glass for the glazing. The wall between the greenhouse and the garage is going to be covered in a stone veneer. The veneer is left over from another project and will work well as additional mass/heat sink for the greenhouse.

To prolong the life of the structure, it is recommended that the framing be sealed. The stone veneer would also benefit from being sealed with something. Since this is where we are growing a lot of our own produce, and we try to keep things organic, I’m trying to find an effective sealer that is also safe for this type of environment. It would be great if it is something that could be sprayed on since it’s a large structure and the veneer will have a course texture.

I’m thinking some of you guys that make cutting boards would have some good recommendations.


4 replies so far

View FirehouseWoodworking's profile


705 posts in 3237 days

#1 posted 09-08-2010 08:49 AM

Thompson’s Water Seal, IMHO.

-- Dave; Lansing, Kansas

View hObOmOnk's profile


1381 posts in 4092 days

#2 posted 09-08-2010 01:23 PM

Real Tung Oil diluted about 50/50 with mineral spirits will seal the stone and add some protection to the redwood.
Additionally, you might want to consider a Spar Varnish for the redwood.

-- 温故知新

View Gene Howe's profile

Gene Howe

10350 posts in 3392 days

#3 posted 09-08-2010 02:24 PM

PLEASE look into a product by Sikkens paint called Cetol SRD.
We have used it on both pine and redwood. It will last outside, without need of touch up, for several years.
When protected, indefinitely.
We did all our deck boards before we installed them. Several drips on to the concrete under the saw horses. An 1800 psi power washer after paint thinner followed by TSP will NOT remove it!

-- Gene 'The true soldier fights not because he hates what is in front of him, but because he loves what is behind him.' G. K. Chesterton

View Lumber2Sawdust's profile


139 posts in 2829 days

#4 posted 09-08-2010 03:23 PM

Thanks for the replies so far. My wife read some suggestions for Tung oil elsewhere, which won’t be cheap, but sounds workable.

Gene, I looked at the Sikkens product, and went to their MSDS page. The warnings on that page read like the warning for a toxic waste dump! This is for the inside of a greenhouse. Imagine rubbing your broccoli against this stuff before eating it. (assuming you like broccoli) It’s not that we will be spraying this stuff while there is stuff actively growing in the greenhouse, but I don’t want my to grow stuff in an enclosed space with that many bad chemicals.

I didn’t check out the MSDS on Thompson’s, but I suspect it has a similar list of things I don’t want on veggies.

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