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Old 09-27-2010, 12:50 PM   #1
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Can anyone recommend a caulk/nail filler for Azek that won't discolor?


I recently installed Azek 1x4 trim around a few windows, and now I'm looking for something to fill the screw holes and seal the gap between the window and trim. The key here is that I want something that won't discolor, because I really don't want to paint the Azek.

For the holes, I was looking at TrimBonder. Has anyone used it? Home Depot now sells small tubes that fit in a standard caulk gun.

That might work for the holes, but I don't think I can use it to seal around the window. Any suggestions for caulk?

Thanks.

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Old 10-07-2010, 07:40 PM   #2
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Can anyone recommend a caulk/nail filler for Azek that won't discolor?


Shameless bump ... suggestions, anyone?

On a related note, I went to a building supply place and they recommended a caulk called Duo-Sil for around the windows. They said it won't discolor, but I was hoping to get a second opinion from someone who has used it.

Also, for filling screw holes in the Azek, they recommended Bond & Fill. The only problem is that applicator tool is pretty expensive.

Has anyone used either of these, or the TrimBonder product that I mentioned in my initial post?

Thanks.

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Old 10-07-2010, 08:51 PM   #3
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Can anyone recommend a caulk/nail filler for Azek that won't discolor?


What about a product called Quad I have used it before on trailer windows that were leaking. Works absolutely great. Menards handles it in several colors, also we have a Standard Lumber store here that also carries it in most of the colors.
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Old 10-08-2010, 07:56 AM   #4
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Can anyone recommend a caulk/nail filler for Azek that won't discolor?


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Originally Posted by merle View Post
What about a product called Quad I have used it before on trailer windows that were leaking. Works absolutely great. Menards handles it in several colors, also we have a Standard Lumber store here that also carries it in most of the colors.
Thanks merle. I hadn't heard of that product, but I checked out their web site and it sounds like a good fit. It looks like Home Depot sells it also (Menards doesn't have stores around here).

In your case, has it stayed white (or whatever color you used)?
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Old 10-08-2010, 09:50 AM   #5
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Can anyone recommend a caulk/nail filler for Azek that won't discolor?


GE white 100% silicone caulk should work.
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Old 10-08-2010, 11:29 AM   #6
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Can anyone recommend a caulk/nail filler for Azek that won't discolor?


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Originally Posted by Ron6519 View Post
GE white 100% silicone caulk should work.
Ron
Thanks for your reply, but I've had a bad experience with that. That's what I used when I installed my windows to caulk under the nailing flange, and also the flashing over the flange where it meets the window. It was exposed for a while before I installed the window trim, but even after a week or two it was starting to turn yellow. I still have a few that have been exposed since June, and the caulk is brown now. I don't think it's naturally discoloring. More likely, it's dirt and pollen in the air sticking to it. But regardless, I wouldn't use it for an exterior application that is going to be exposed. And, if it turned yellow and I decided to paint it, silicon caulk won't hold paint.
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Old 10-08-2010, 12:23 PM   #7
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Can anyone recommend a caulk/nail filler for Azek that won't discolor?


Quote:
Originally Posted by cumak View Post
Also, for filling screw holes in the Azek, they recommended Bond & Fill. The only problem is that applicator tool is pretty expensive.

Has anyone used either of these, or the TrimBonder product that I mentioned in my initial post?

Yes, I trimmed a house in Michigan using Certainteeds version of vinyl trim and used Bond n Fill for countersunk holes, dings, and some glue joints (to compare to marine epoxy). The applicator worked very well but as you say, pricey. I liked the result very much.

The only problem was that it was a top-o-the-line product used on an average house, and I did not recover the cost.
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Old 10-08-2010, 08:58 PM   #8
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Can anyone recommend a caulk/nail filler for Azek that won't discolor?


You don't want the trim almost tight to the window without any room for a proper bead of caulking. The vinyl window and plastic trim expand and contract with the seasons, even between night and day as the temperature changes. You cannot get a proper "hourglass" shape of caulking without a backer rod or poly tape. Very important to have the caulk bond on the sides, not the back as some just fill it up. Leave a 3/16" gap there and use some 3/8" backer rod before caulking, pushing it in as explained: pp. 30: Exterior Siding, Trim & Finishes - Google Books

pp. 35: Architectural detailing: function ... - Google Books

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Old 10-08-2010, 09:37 PM   #9
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Can anyone recommend a caulk/nail filler for Azek that won't discolor?


Oh yeah... to clarify, I did not use the bond n fill to do caulk gap between the trim and window, nor between trim and siding. Just to fill holes and for glue joints
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Old 10-08-2010, 10:46 PM   #10
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Can anyone recommend a caulk/nail filler for Azek that won't discolor?


Quote:
Originally Posted by cumak View Post
Thanks for your reply, but I've had a bad experience with that. That's what I used when I installed my windows to caulk under the nailing flange, and also the flashing over the flange where it meets the window. It was exposed for a while before I installed the window trim, but even after a week or two it was starting to turn yellow. I still have a few that have been exposed since June, and the caulk is brown now. I don't think it's naturally discoloring. More likely, it's dirt and pollen in the air sticking to it. But regardless, I wouldn't use it for an exterior application that is going to be exposed. And, if it turned yellow and I decided to paint it, silicon caulk won't hold paint.
You must have gotten a bad batch. I've been using it for years without a color change in exterior applications.
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Old 10-08-2010, 11:23 PM   #11
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Can anyone recommend a caulk/nail filler for Azek that won't discolor?


fill and paint,makes it look like real wood
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Old 10-08-2010, 11:30 PM   #12
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Can anyone recommend a caulk/nail filler for Azek that won't discolor?


Quote:
Originally Posted by steveel View Post
Yes, I trimmed a house in Michigan using Certainteeds version of vinyl trim and used Bond n Fill for countersunk holes, dings, and some glue joints (to compare to marine epoxy). The applicator worked very well but as you say, pricey. I liked the result very much.
Thanks for the recommendation. On their web site they show a small 1.6 oz cartridge that you apply with a standard caulking gun. If I can find that somewhere I'll give it a try. If not, I don't think I want to buy the applicator so instead I'll try TrimBonder (which *looks* like a similar product, and is available at HD).

Quote:
Originally Posted by GBR in WA View Post
Leave a 3/16" gap there and use some 3/8" backer rod before caulking, pushing it in as explained: pp. 30: Exterior Siding, Trim & Finishes - Google Books

pp. 35: Architectural detailing: function ... - Google Books
I never realized there was such a science to this. I did leave a small gap, so I'll see if i can get a backer rod in there. Thanks.
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Old 10-09-2010, 12:14 PM   #13
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Can anyone recommend a caulk/nail filler for Azek that won't discolor?


Azek makes screws and plugs specifically for this purpose. They're expensive, but if you're being fussy, then it might be worth your while

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