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Old 09-12-2003, 06:01 AM
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Default Dock Preservation/Sealant

It's been six months since the dock was built and time to apply some sort of wood seal. I've used Thomson's Water Seal on decks and was not impressed. I'm not really interested in stain but can do if that's the only way to get a good seal. Any recommendations would be appreciated.

Thanks in advance.
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Old 09-12-2003, 06:05 AM
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Default Dock Preservation/Sealant

Hate to tell you this buy for a stright water repellent you hove only one real choice Thomson's
There are lesser brands out there but you will really not like them try pressure washing before yoy apply and reapply every other year and simply use a pump up sprayer and let the sun bake it in ....John
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Old 09-12-2003, 06:13 AM
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Default Dock Preservation/Sealant

IMHO Thompson's is crap. Look for "wood preservative" on the label, which means it will have a mildewcide in it. "Mildew resistant" doesn't mean squat, you want an active ingredient that kills mildew. I would also shy away from siliconized water proofers, extremely difficult to apply unless you're going to brush each board from end to end. I've had good luck with acrylic solid color stains made by Valspar - they're best will have a 7 year warranty, and you can spray or roll it and get good results. Have fun!
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Old 09-12-2003, 06:27 AM
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Default Dock Preservation/Sealant

How old is the deck and what type of wood is made of? Maybe you shouldn't put anything?

I agree with the guys above about Thompson's; don't waste your money. I'd apply a good healthy coat of Linseed oil all around. This will put life back into the wood. Let cure then apply a good acrylic solid color stain as coastboater mentioned.

Keep Smile'n, It's a nice day to be alive.
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Old 09-12-2003, 06:33 AM
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Default Dock Preservation/Sealant

We only found one really good product for decks/docks. Its made by Wolman and the product name is "Extreme". It must be applied in two coats, the first one sinks into the wood and the second coat adhears to the first and creats a strong top coat. Its much more expensive than Thompsons but it hold up great.

Wolman Extreme Site
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Old 09-12-2003, 06:41 AM
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Default Dock Preservation/Sealant

As much as I hate to buy Home Dope products, I've had good results with the Behr's waterproofing with linseed oil. It'd a little thick but does a good job. I clean the dock each year and coat it. The dock is over 10 years old. It gives the deck a nice honey color. Hopefully your Home Depot carries it, because I found their products to be regional.

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Old 09-12-2003, 09:33 AM
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Default Dock Preservation/Sealant

I have had very good luck with a product called WoodRX. It is water based and can be applied even when the boards are slightly wet. It took two coats but has held up well over the last year. My dock was built about 2 years ago with wax penetrated wood, so I was told to wait a year to allow the wax to burn off. It seems to have protected the wood very well. My dock guy bought it for me so I don't know where it can be purchase.
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Old 09-12-2003, 09:55 AM
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Default Dock Preservation/Sealant

Thanks for all the replies. The dock is made of pressure treated....pine I assume. Damn near all wood used here in FL is pine to my knowledge. I was told to wait six months or so before treating. I have also used Behr's (sp) on a fence with good results. I will check into the other recommendations as well. I only have about 320 sq. ft. (all they would allow down here in Pt. Orange). I just hope I still have a dock considering the storm approaching. On a good note the mullet are migrating south and I've never seen so many along with the predators consuming them. Last night I caught a nice flounder and a 24" snook in about 15 minutes of fishing. Turned them both loose. Hope to get big daddy snook over the weekend.
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Old 09-12-2003, 11:51 AM
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Default Dock Preservation/Sealant

I have used Cabots 1400 clear with excelleent results on a pressure treated deck. I apply every other year, about $20 +/- a gal.
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Old 09-12-2003, 01:38 PM
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Default Dock Preservation/Sealant

thomson`s is a joke everywhere....cuprinol WAS
the stuff, but is eco`d into oblivion now....
deks olje #1 is excellent, but any oil including
the linseed oil, will do what you need....the
frequency of application counts far more than
'the brand name here, ie the key ingredient
is "elbow grease" in all these products....dan
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Old 09-12-2003, 01:51 PM
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Default Dock Preservation/Sealant

fish_on,

What's the warranty on the pressure treated lumber down your way? The reason I'm asking is because at 320 sq.ft so what if you have to change it out every 7-10 yrs.. When one adds the expense of dressing the lumber every year, the time and labor, why bother; let the wood be o'naturel.

Who applies sealers and preservatives to the underside of their decks? Sealers and preservatives are to repel water. A dock is exposed to possibly 10 times the amount of water from the underside, and yet few if any people treat the underside - so why bother with the topside.

Now if you say for looks and the money thing isn't a problem, go synthetic lumber (can be bought at Home Depot) and you have all the best features. No twisting, cupping, splitting, nail pops, annual maintainance or expenses. Besides it looks great for a very very very long time. Cheaper in the long run!

Keep Smile'n, It's a nice day to be alive.
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Old 09-12-2003, 01:54 PM
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Default Dock Preservation/Sealant

Linseed oil and so forth is not water repellent. Look here for the best product on the market for your application..
http://www.waterlox.com/product.cfm?productid=17
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Old 09-12-2003, 01:55 PM
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Default Dock Preservation/Sealant

Tung oil is not a new ingredient. Chinese merchants used tung oil back in the 14th century to waterproof and protect wooden ships from the eroding powers of the sea. Thin, transparent and taken from the nut of the tung tree, this rich oil never loses elasticity and penetrates deep into the pores of the wood.

Waterlox vs. Linseed Oil – Waterlox provides deeper penetration to seal wood fibers beneath the surface. Waterlox is waterproof and will not water spot like linseed oil.
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Old 09-14-2003, 06:09 AM
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Default Dock Preservation/Sealant

Don't worry about treating your pt dock wood. I have a 40'x5' dock we built in 1971 of pt and it has never rotted. Not too far from you at Merritt Island on the Banana River. I had to replace a 10'deck section at 27 yrs when the hurricane came in and took a few planks out. If it wasn't direct riverfront this wouldn't have happened either.

Otherwise, the pt wood is just old and weathered but structurally ok. The dock is fastened with hot dipped galvanized nails/spikes and needed refastening after 15-20 yrs.
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Old 09-14-2003, 06:22 AM
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Default Dock Preservation/Sealant

As stated by others Thompsons is junk. If you really want to preserve your wood use Sikkens dec base and then a year later you top coat it with Sikkens dec. Now you are not going to buy this at Lowes or Home Depot and you are not going to get it for $10 a gallon but when you get done you will have the best finish possible for wood.
I think they have a web site, I will check on it for you and post it when I find it.
P.S. the base is going to cost you some where around $55 per gallon and the top coat $45 per gallon. It may seem high but when you get finished you will see the diff

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Old 09-14-2003, 08:26 AM
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Default Dock Preservation/Sealant

Some Good advice above

There is no reason to believe that The Thompsons type products will help at all. Nothing clear will help either. I suggest either just leave it as recommended above or after at least a year or two use any decking product with lots of pigment. It won't hurt to put it on now but it will stick better after some of the preservetive oild dissipate from the surface.

The wood will deteriorate due to the sun and water and the relative proportions of each. IMHO, The only thing that you can really protect against in that environment is the sun. Light colored Solid or semi solid stains can help. I would not recomment paint.

There were some guys on this board that were chemists or engineers for paint companies maybe they can add something.

Good luck!
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Old 09-14-2003, 09:00 AM
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Default Dock Preservation/Sealant

Thanks again for all the replies. I definitely do want to apply something good. I have some areas developing that could give you some nasty splinters and I'm hoping the seal will help smooth this out a little. I have no intention of using paint.

Garrett, to answer your question I have no idea on the warranty of the PT lumber. I'll look into the high end products mentioned above and call the companies to see what they say. IMO you get what you pay for...most of the time anyway.
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Old 09-14-2003, 11:32 AM
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Default Dock Preservation/Sealant

fish_on,

I've seen several decks down on the water with this synthetic lumber product that have had 3-4 yrs. expossure; defy anybody to say it wasn't brand new. Do it right today and forget about it!

Keep Smile'n, It's a nice day to be alive.
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Old 09-14-2003, 02:37 PM
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Default Dock Preservation/Sealant

Garett is ofcourse right just get the lightest color synthetic you can

I thought you already had the dock....
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Old 09-14-2003, 07:41 PM
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Default Dock Preservation/Sealant

I take it he does too. But I'd think he is chasing good money after bad. At 320 sq.ft., that's how I'd be looking at it.


Just so you guys know, I wasn't suggesting Linseed Oil for repling water, it was just to put some life back into the wood; with a sealer on top to lock it in.

Keep Smile'n, It's a nice day to be alive.
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