I use Coastal Enterprises PB Bond-240 when I laminate my HDU (Precision Board) not Epoxy for just the reason you mention. The PB Bond 240 is like gorilla glue but it doesn't expand as much. If its a small piece I clamp things up good. If it's big I screw it tight them take out the screws later. It leaves small holes where the screws were but its no big deal.
Gregg, I've been using polyurethane glue from I think AVS company- but you can get it from Mitre-10 hardware stores up here. It's #705 & 706. Like gorilla glue, it expands & cures as it absorbs humidity & moisture.
What I'm uncertain about is what's the best filler for filling holes & scratches/gouges. The 2 part auto bog is too hard & when sanded leaves obvious marks around the site as the HDU sands more easily.
I tried a waterbased spakfiller type of stuff, but when I put the zinnzer u/c on, it sort of washed it back off.
Maybe i SHOULKD GRAB SOME AQUADHERE & MULTIPANEL DUST & MIX THAT UP...oops sorry about the caps lock.
[ July 25, 2010, 01:37 AM: Message edited by: Ian Stewart-Koster ]
-------------------- "Stewey" on chat
"...there are no limits when you aim for perfection..." Jonathan Livingston Seagull Posts: 7016 | From: Highgrove via Toowoomba, Queensland, Australia | Registered: Dec 2002
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That PB bond is some good stuff, like Dan said, it is not nearly as messy as Gorilla glue.
Joe, the spot putty is good, but I've run into cases over the years, where is shrinks as it dries, requiring multiple coats. I've been using an indoor/outdoor spackling compound, made by DAP, I think, that is very light, fast drying and easy to sand. It has a similar consistency to the HDU. Sometimes, when using a filler, when you sand it...if the filler is harder than the foam or vice-versa, it can make sanding more difficult. This stuff sands very smoothly.
-------------------- Dale Feicke Grafix 714 East St. Mendenhall, MS 39114
"I can do all things through Christ, who strengthens me." Posts: 2963 | From: Mendenhall, MS | Registered: Apr 1999
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PS Ian, I fill heavy gouges and holes with auto filler, but when it gets to 75% cured, file the excess off with either heavy sandpaper, or a ladies throwaway emery board. Too hard and is impossible to remove without marring the HDU.
Standard sheets after a light sand I "trowell" Viponds Hi Build Sanding Sealer over the whole sheet. After drying and a light sand comes up smooth as - ready for rolling undercoat and then main coats.
-------------------- Gregg Sydney Signworks (02) 9837 1198 Schofields NSW Australia Posts: 368 | From: Schofields | Registered: May 2007
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I presume the fellows are meaning fiberblass resin.
Here's one of my favorite hole fillers. Mix equal amounts of Fiberblass resin with Bondo. Add both hardners and pour into holes. After a few minutes, when the mixture gets leathery, a sharp chisel is used to slice off any excess. It's ready to paint in an hour.
-------------------- Joe Crumley Norman Sign Company 2200 Research Park Blvd. Norman, OK 73069 Posts: 1428 | From: 2200 Research Park Blvd. | Registered: Sep 2001
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Gregg, When I use to use the Epoxy to Join HDU I would put it on a little thicker. 1mm (1/32) It seemed to me if I would go thinner it would Soak up in the HDU and Adhere the 2 panels together improperly, Leaving voids that I would have to comeback and fill. In a Pinch I have used Titebond 3 on HDU but not recommended (Way different bond line and a pain to blend) I now "like every one else" use the PB Bond,if I don't want to wait on delivery the Gorilla Glue but GG makes a Huge MESS and you need a lot of clamps to keep you panels from lifting and shifting
[ July 25, 2010, 12:31 PM: Message edited by: William DeBekker ]
I've used both West Systems and PB240 and have had no failures reported with either. The largest sign we did with the epoxy is about 260 miles away from here so I can't check on it to see how it's doing. Both will work if you do it right; but I prefer PB240 because cleaning up squeezeout is easier and because of the fact that you are using urethane to bond urethane.
pb bond here. here is a step by step to show how to laminate 2 pieces together. we use a mesh that is used in brown coating stucco and it is glued between the 2 pieces and give excellent support. i like Dan's idea of the screews but when you blast i am not sure of the reseluts were the screws have been. just my 2 cents...was talking to Joe Crumley today about this very thing! thanks for the call Joe!