Hyde "Wet And Set" Plastering Product For Very Large Gaps: Anyone Ever Use ?

Hello:
Moved into a new house that has a "slot" cut out of the garage ceiling plasterboard. About 5 inches wide by about 6 feet in length.
Think it was for some plumbing repairs a long time back.
Would like to seal it up, and re-plaster it.
Saw the product(s) by Hyde called "Wet & Set"
Some kind of roll of tape that you wet and apply to the plaster. Guess there is an adhesive in iot, and is supposed to grab onto the existing surface of the plaster, and provide a rigid "bridge" over the opening that one can then plaster onto.
Anyone ever use this stuff ? Caveats in using it ?
Is there a better way ?
Does it work, etc. ?
Please see the link to it: http://paint-and-supplies.hardwarestore.com/50-276-tapes-beads-and-patches/wet-and-set-5-x-9 ''-drywall-repair-roll--611775.aspx
BTW: Not competent in plastering: what type and brand of plaster (or is it called spackle ?) should I use ?
Thanks, Bob
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http://paint-and-supplies.hardwarestore.com/50-276-tapes-beads-and-patches/wet-and-set-5-x-9 ''-drywall-repair-roll--611775.aspx
That stuff might be OK. You say 5" wide opening and that stuff is 7" wide. May be a big pain in the arse. What I would do is get some drywall, cut to fit and screw it in place first. Drywall runs about $6 - $7 per 4x8 sheet around here right now. If you go to the blue or orange store you will usually find some damaged sheets. They will probably sell them for like $1 or $2 depending how buggered up. Cut it down with a razor knife right there in the parking lot of you do not have a truck or SUV that can handle the sheet. Us the drywall to bridge the gap. Then you cant just use cheap paper tape and regular drywall compound. There are no miracle fixes for this type of repair.
This article is good but may not be accessible w/o subscription http://www.thisoldhouse.com/toh/knowhow/repair/article/0,16417,215031,00.html and particularly http://www.thisoldhouse.com/toh/knowhow/repair/article/0,16417,215031-3,00.html
Good luck
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Yes, don't use it. Just cut some drywall to fit and then use regular pre-mixed joint compound to set it. It's a garage, right? So it's not like it'll have to be perfect. The only complication might be if there's not enough points to anchor the patching piece of drywall. As in, some nitwit cut the slot along the middle of a joist run or something. That being the case you'll need to add in some sort of supports. A simple piece of 1x3 put inside the slot, across it, will then let you screw through the old drywall to hold the wood in place and then in through the new pieces. Then it's just a matter of slapping on some joint compound, taping it, followed with another coat and then some sanding.
Just remember, if the average contractor can do it, so can you.

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