Outdoor wood preserver and finishing product?

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Hi all,

I'm coming to the final stages on this bench project. The seat is comprised of a couple of new scaffold boards made of an untreated rough sawn white softwood. I'll be sanding them down, but not too much. The bench is located under a canopy roof, so it will not be rained on, however will be subject to seasonal humidity changes and temperature etc.

r/woodworking - Outdoor wood prserver and finishing product?r/woodworking - Outdoor wood prserver and finishing product?r/woodworking - Outdoor wood prserver and finishing product?r/woodworking - Outdoor wood prserver and finishing product?r/woodworking - Outdoor wood prserver and finishing product?r/woodworking - Outdoor wood prserver and finishing product?

I've never made anything like this so need to know what products to apply to finish the wood. My goal is to protect the boards from twisting and bending and stabalise them as much as possible. I don't want to colour it too much really. A slightly golden colour or light oak is fine, and it adjoins a cedar clad garden room. I also don't want a glossy or plasticy look. I like the idea or an oil or wax, but I'm not sure if they do much in terms of long term protection. One thing I do have in my shed is some Barrettine Clear Universal Wood Preserver which I bought for the garden room:
  • Contains Tebuconazole, Permethrin & IPBC.
  • Protects uncontaminated timber against wet rot, decay and wood boring insect attack.
  • Suitable for use on all types of timber, rough, sawn or smooth.
Barrettine

I've also come accross a similar product, OSMO WR Base Coat, which actually sounds similar, but more suitable:
  1. Extremely water repellent
  2. Resistant to blue stain, rot and insect attack
  3. Reduces wood swelling and shrinkage
  4. No future application necessary
  5. 4001: Oil-based, brush or roller applied only
WR Base Coat

Both of these are just a base product requiring the use of an oil or other finishing product. The OSMO specifically mentions that it "Reduces wood swelling and shrinkage" which appeals to me, but is this also implicit of other similar products, like the Barrettine Clear Universal Wood Preserver? If not, I may choose to buy the Osmo WR Base coat instead.

Does anyone have experiance of either? And what of recommendations for a low sheen product to go over the top for a bit of depth and protection? Osmo oil, Tung oil, Boiled Linseed?

Thanks for any advice
 
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Thanks for that suggestion, I'd not heard of those products before. Do you have good experience with them?

The Osmo lists "Reduces wood swelling and shrinkage" as one of its properties, but I wonder if it really excels at this or it's not it's main USP? I emailed Barrettine and they made no claim of having similar properties. I do like the sound of it, but I guess this is what a topcoat might do anyway, right?
 
Are you going to biscuit join the boards or just screw up from the underside?
 
Are you going to biscuit join the boards or just screw up from the underside?
I don't have a biscuit cutter, but I was going to dowel them. That was my original plan to brace everything together if they ever try to start twisting. However, I've since had second thoughts because I've realised that wood outdoors must ultimately move with moisture absorbtion and temperature, so perhaps the bracing aspect is ill advised. Instead I'm thinking I should leave a 1mm gap between all the boards to give it some space for movement.

Here's the finished miter I cut which is done so hopefully it can freely slip over itself through seasonal change:

IMG-1540.jpg


IMG-1542.jpg


IMG-1548.jpg


IMG-1546.jpg


IMG-1567.jpg


I'm still debating this last point though, I still like the idae of tightly binding everything together and and the boards to the frame and wonder if that would serve to reduce movement and contain it??
 
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I would go for the small gaps between the boards and joins. If the wood expands, and the joints are tight, then it just HAS to twist somewhere, no matter what way you make the joints.
 
OK, thanks for that advice. Yes, I'm working on this today so in that case I'll place some temporary 1mm spacers between all boards while setting out and then remove them before fastening anything down. Cheers
 

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