ok...I'll let it drop...

Guess that's a "no", huh? I've never used Weldbond...so I'm no help.

Linlee, I have been looking as I have a few wedi boards also and would like to know the answer to this. Did you check the site below? ( The print is so small and my eyes are tired but there has to be something in here)
Please post back if you find the answer.
Lori

Here is a link that might be useful: wediusa.com

I'm going to guess that you can use weldbond without sealing it first, for 2 reasons - it takes for ever for it to dry on nonporous surfaces and it can be a sealant on porous surfaces. so it stands to reason that you could get the best of all worlds - coat the surface and the tesserae.. or just go with thinset! LOL

Linlee, Do you mean hardibacker that is used as a base for floors? I ask because you say porous.

I have mosaiced on hardiboard (the planks used for siding) and have used Weldbond and E6000 with no problem. I am working on one now that I used thinset, because I know it will be used outside.

Well first of all it's for inside. Second, I really won't be using
Weldbond, but Mac. Nice, I get your point about the Weldbond not drying fast but used that in my inquiry only
because not many have used the Mac yet and they do have a lot of similarities.
I want to use the Hardi because I already have it, well the DH does anyway, and because
of the cost for Wedi would kinda be a waste in this application.
Meadel, yes Hardi the floor tile substrate. Usually it's recommended that you spritz with water before thinset/tile application because it is absorbent.
I really want to do Mac on Hardi but wanted to check before
I went ahead and had all the glass pop off at me.
Thanks all!
Linlee

sooooo then you'd have to seal it! LOL I guess that answers that!

doh!...I guess we all have our insecure moments.

Thanks for asking Linlee. This is an interesting question. I was looking to buy the rotozip for cutting the cement backer board. Then the guy in the store had me so confused by talking about hardi board and wedi board that I got sick to me stomach and left the store with no tool or board. GGGGGGGRRRRRRRRRRRr Does nothing good to confuzzle an old lady.I will try again next time we go to town.

Chris

I wouldn't think you'd have to seal it. I think the spritzing of water for thinset is because otherwise the board would suck the moisture out of the thinset before it could cure properly. If you're using weldbond or mac, I'd think it wouldn't be an issue.

Thanks :)
That all makes sense.
For some reason I wasn't able to wrap my mind around
the combination of materials.

Well I got a response from "Macglue" today:

"hardi board? is that like concrete backer board? why don't you just glue 1 piece on it and see"

I didn't find this very satisfying. Point being I
could use peanutbutter on it and it would stick...for
awhile anyway.
I was hopeing the makers of the product would have a clue.
I hate being a guinie pig sometimes.

There was a thread about this on yahoo groups.
The reply was you didn't have to seal hardi or wedi, and your choice of adhesives depended upon the arts enviroment. (Mac or weldbond will be ok as long as not placed outside.) She did say though, that you should apply several coats of grout sealer to your finished piece.

Thank you Bama.

I sent a response back to Mac (minus the peanutbutter
remark) that I will find an alternative adhesive and received a more favorable reply:

"use mac! ugh we have had mastic and thinset problems...
actually do a little test... put a piece on with mac
and with thinset.. let dry and see which holds better...
we have already done that test... we had to use a razor
blade with mac but the thinset knocked off... thinset is
better equipped for more porous material such as tile...
not glass... even the ones with adhesive resins dont
give you that same cling.... also mac grabs very quickly
on concrete etc...

I feel better now.

How frustrating. I got a remark like that the other day when I emailed WholesaletileUSA about what is out there for styles that would resemble enamel finish. They hadn't a clue, and wouldn't even suggest any of their own products as being "close, but may or may not be what you're looking for."

When emailing companies, we expect them to be the experts on their product, and their sector of the market...what is out there, even if they themselves don't carry it for whatever reason. I was pleasantly surprised to find that one of the members here suggested that Wit's End might carry something that would work for me, and yes, they did. Glazed Ceramic was exactly the look I was seeking. It seemed too simple. Why didn't Wholesalers suggest this? All they said was that they didn't think anything existed that would suit my purpose from any retailer.
Totally frustrating answer.

To retailers: If you sell something, or specialize in something, KNOW YOUR PRODUCT INSIDE & OUT, WHAT IT'S LIMITATIONS & STRENGTHS ARE. DON'T MAKE THE CONSUMER DO YOUR R&D FOR YOU!