I need an estimate of coverage. The two 6oz containers -- would they be enough to fill gaps that are, in total, about the volume of a softball?

This is an educated guess but I'm thinking you would come up a bit short. If you would need just that much or a bit more I don't think the 6 oz containers will do it. If you need a bit less than a softball size, you might make it happen. Keep in mind that once mixed you have to apply it within a certain period of time. For each application I applied it, there was some that was wasted as I filled the voids and then removed the excess.

the bottom horizontal part of my window sash has rotted, just on the ends. will this stuff work and how do I get it to stay on and not drip out

Hopefully the prior answer went out to you. In brief. Take out all the rotted wood. To be especially safe put in a few small flat head steel wood screws so the heads are well below the finished surface and undermine some small holes with a 1/8th inch drill. To support the bottom put saran wrap over a thin sheet of plywood or a roofing shingle and clamp or screw it in place. That should keep the support from sticking. Plan 24-48 hours for it to become workable. Depending on your temperature. I used it indoors and the temp was about 70 degrees. Test it for workability after 24-30 hours. It is really stiff when it goes on and I was really suprised at how well it worked in adhering to oak. The last church pew I repaired, I only roughened the surface of the wood and drilled a few holes. I worked it to shape with wood chisels, very sharp, and a sanding block Initially use a course paper, then work down as you get closer to the finished surface. I was putting in wood grain and matching 3 different colors in the oak, and really had no problems. I was very pleased with the product. Incidentally this church had been told the problem was not fixable.

can I use this outside if the temp is under 50 degrees?

I have not had a problem but your question is not very clear. Do you want to apply at 50 degrees or after cured will it hold up. I'm in Arizona and the winter temp hits freezing with no trouble. If you want to discuss more, Abatron's number is 800.445.1754

ASIN	B0149KZAX8
Best Sellers Rank	#77,577 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #467 in Epoxy Adhesives
Brand	Abatron
Brand Name	Abatron
Compatible Material	Wood
Container Type	Can
Customer Reviews	4.4 out of 5 stars 858 Reviews
Global Trade Identification Number	00051191441066
Included Components	1
Item Form	Putty
Item Package Quantity	1
Item Weight	0.51 Pounds
Manufacturer	Abatron
Material	Epoxy Resin
Material Type	Epoxy Resin
Model	WEAB6OR
Other Special Features of the Product	Shrink Free
Special Feature	Shrink Free
Specific Uses For Product	wood
UPC	051191441066
Viscosity	High Viscosity
Volume	340 Millilitres
Water Resistance Level	Not Water Resistant

Abatron WoodEpox Epoxy Wood Replacement Compound, 12 oz Kit, Part A & B

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