Looking for suggestions on which caulk/sealant to use on the exterior, mainly around windows/doors ('innie' mounted -- technically 'in-betweenie'), and also doubles as an adhesive (if possible I could use something else for this particular purpose). This would be hit directly by sun and the elements, so that's the biggest issue. I only want pure white, so coloring/painting means nothing to me.

Another thing is I had planned to use Siga Wigluv for flashing/air sealing, so it can't have any petro-chemicals in it (they will eat away at the Wigluv over time). I'm not familiar enough with chemicals to know if polyurethanes will be an issue.

After reading to the end of the interweb, I have found the following recommendations from various people:

1) OSI Quad Max
2) NPC #900 Solar Seal
3) Tremco Vulkem 116
4) Tremco Dymonic FC

Best I can tell, the OSI would be locally available, whereas the others either from online or specialty stores. That's not too big of a deal though. Price is a factor, but not if it means getting an inferior product that won't last.

Thanks.

I'd look up the specs and decide mostly based on them. Also consider Dymonic 100 (-50+100% movement).

Thanks for the tip on the Dymonic 100. I guess my biggest issue is I'm not sure how to read the specs. I'm not a builder and all I know is I need something that can adhere to just about anything and last a long time in direct sunlight and weather. I can't really find anything substantial so I might just have to take an educated guess at it.

OSI Quad Max looks like the best on your list.

Id go with tremco dymonic fc, great sealant that stands up long term with 35% movement. It guns really easy although OSI quad has always been good, used to gun really hard but they must have reformulated maybe to compete with DAP 920, maybe where the "max" came from, because the quad is definately more toolable than it used to be. Tremco is great but you need to be good with a caulk gun if its a finished joint cause you'll make a mess real fast.

Look for a class 35 minimum and dont cheap out. Joint design and application is way more intense than you'd think if you want it to be a long term seal.

Thanks. My window manufacturer recommended Sikaflex, which I started looking into as well. Seems like a good product (as far as I can tell) and is available at HD.

Does anyone know the difference between these 2 model #'s?

221062 - http://www.homedepot.com/p/Sikaflex-10-1-oz-Flex-Construction-Sealant-White-221062/206200507
90618 - http://www.homedepot.com/p/Sikaflex-10-1-fl-oz-White-Construction-Sealant-90618/202529347

Home depot doesnt give you much info, and I could only find 1 of the 2 on sikas site. Could be a different voc level, One mentions moisture cure the other does not. The one I found said class 25, yet the product sheet said class 35 (better), so some inconsistency from the manufacturer.

Bottom line, you should be fine with either in a behind the nailing flange application, your main air seal will (should) be the expanding foam between the frame and rough opening. The type of joint squishing sealant between the house and a nailing flange, then compressing it with nails isnt very robust at all, and I've never pulled a window that relies on that joint alone and had trouble taking the frame out. Expanding foam on the frame grips quite well and seems to be a much more reliable seal.

I've done a few houses with no sealant behind the flange at all, and instead use membrane tape and expanding foam and get great blower door results based on the premise that your wrb or tyvek or typar or whatever you use can in no way be a good, reliable air barrier.

Thanks. I'll just contact the manufacturer and see what they can tell me.

EDIT: I did notice they have a Sikaflex and Sikaflex+. The + version is the class 35 and the non + version is class 25.

I have never been a fan of box store sealants....They are designed to have to be replaced....that is how they make their money.

For exterior I like Solarshield, not a caulk expert but have never found one I love.

Also it seems like they have got any better over the years like I feel they should. Window manufactures seem like they have good sealants that last but not sure what they use.

Spray foams that I've seen perform terribly when it comes to movement in small gaps. It seals initially, but if the gap opens by 1/8" with temp or moisture, you have a 1/8" air gap. So foam backer + good sealant and/or tape are your air barriers.

Max UV resistance might be a place to prefer silicon sealant over a less proven polyurethane hybrid. But the latter is a better adhesive.