Taking Care of Woody Exterior

Finishes, paints and coatings

Taking Care of Woody Exterior

Postby hikerainorshine » Thu Jul 28, 2016 11:47 am

I have an old woody teardrop in excellent condition but the exterior roof to sidewall trim pieces(wood strips) have some areas with separation I would like to fill in. Could someone give me advice on how to do this? The gaps are anywhere from 1mm to 1/8" thick. Whatever I use will need to be flexible, waterproof and somewhat retain the natural wood look. I was thinking of using anything from brown colored caulk, construction adhesive or gorilla glue. I called Minwax and they said wood filler and then poly over, but I think that would crack again quickly. Thanks ahead for all your ideas and help.
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Re: Taking Care of Woody Exterior

Postby tony.latham » Thu Jul 28, 2016 4:00 pm

Photos would help greatly! :thumbsup:

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Re: Taking Care of Woody Exterior

Postby KennethW » Thu Jul 28, 2016 4:55 pm

If wood fill gets wet it fails in my experience. I would be inclined to use polyurethane caulk. But I am sure you will get better advice.
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Re: Taking Care of Woody Exterior

Postby Rick Tyler » Thu Jul 28, 2016 6:27 pm

Look into 3M 4200 marine caulk/adhesive.
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Re: Taking Care of Woody Exterior

Postby hikerainorshine » Thu Jul 28, 2016 7:24 pm

20160728_172645.jpg
Camper
20160728_172645.jpg (194.13 KiB) Viewed 957 times

Here are some pics of where the wood trip is split slightly.
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20160728_172744.jpg
Wood Trim
20160728_172744.jpg (163.34 KiB) Viewed 957 times
20160728_172723.jpg
Wood Trim
20160728_172723.jpg (186.33 KiB) Viewed 957 times
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Re: Taking Care of Woody Exterior

Postby tony.latham » Thu Jul 28, 2016 9:06 pm

It's happening because the wood is moving as it expands and contracts from moisture (in the air).

I'd try to get as much polyurethane sealant into those seams as possible. I sure wouldn't use an off-the-shelf wood filler. You might toy with PL Premium polyethylene adhesive. Although it's marketed as a glue, it also makes for a good sealant and is tan in color and the consistency of caulk.

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Re: Taking Care of Woody Exterior

Postby hikerainorshine » Thu Jul 28, 2016 9:21 pm

thanks! I'm thinking of using Gorilla glue for the small areas, it dries yellowish orange so it might blend in. I think I can put some glue in a syringe to squirt into the small areas. I will probably use some type of polyurethane sealant for the larger gaps.
Does anyone have a favorite finish for recoating the outside wood with? I'm thinking of using MinWax Helmsman.
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Re: Taking Care of Woody Exterior

Postby Tomterrific » Fri Jul 29, 2016 12:46 pm

I'm a big fan of polyurethane caulk. Rather than just filling the gaps, which can be messy and might let in water, place tape on either side of the gap. You can work in the caulk and smooth the surface. When the tape is pulled you will have nice crisp lines and enough caulk to keep water out. I'm thinking approximately inch wide lines over the seams. Get brown darker than the wood and caulk all along the seam/joint.

Gorilla glue foams like mad but it does penetrate wood. You might want to experiment with using some GG before the caulk. Better may be to use thinned polyurethane spar varnish drizzled into any open seam to penetrate and seal the wood before caulk. Spar varnish is what you will use to coat the wood and Minwax should be a good product. Even if your plan is merely to fill the crack with caulk I'd do the thinned poly first to seal any water damage.

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Re: Taking Care of Woody Exterior

Postby hikerainorshine » Fri Jul 29, 2016 1:17 pm

thanks for the responses, great ideas. I hate how messy polyurethane caulk/adhesive is, I have used it on my old Airstream, but it seals works great. The tape is a great idea to keep it neat, and I will squirt some thinned varnish to help seal the wood.
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Re: Taking Care of Woody Exterior

Postby yrock87 » Sat Jul 30, 2016 6:32 pm

Epoxy? It seals and bonds, and it is clear. Looks like you only need as much as in the "craft" kits for $20.
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Re: Taking Care of Woody Exterior

Postby nevadatear » Tue Aug 02, 2016 5:51 pm

I am not a big fan of helmsman. I had horrible bubbling and orange peel. I would use thickenened epoxy.
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