73 corvette panel joint

[Bob Hollinshead]

fillers do not stick to epoxy resin...and as far as I'm concerned, not to any unscuffed epoxy primer

Polyester fillers adhere really well to unscuffed SPI epoxy primer if the application timing is correct- the bond is stronger than the product. I've used SPI epoxy primer as a tie coat+polyester fillers for cosmetic repairs on SMC and never had any problems-zero.

 

[dt196]

The Fiberglass Evercoat SMC panel adhesive that Barry is talking about is 994 (http://www.evercoat.com/productDetail.aspx?pID=18). I have found that if a SMC panel is installed with this adhesive and given a few days (like you would give an epoxy to attain full strength) that you will delaminate the SMC before the bond will break. I use it for installing panels on all C1-C3's. Again the taper is key in preventing ghosting down the line.

 

[shine]

the adhesive filler is #870 .

 

[walkvet48]

Thanks to all for your responses.

George

 

[shine]

george , the 870 is a filler adhesive and is used like bondo. you wont need the panel bond unless your working with a newer car.

 

[dt196]

I can't comment on the 870, but I use the 994 on all seams that I feather out. I find that the hardness more matches the original bonding adhesive and does not undercut easily, thus only needing a light skim coat of finishing glaze to be ready for epoxy. I also use it for any non structural (surface stress) cracks (like the corners of the rear deck vents on C3's or headlight openings on C2's). I use the 994 as it will bond to both FRP and SMC, so I only need to stock one product where as the 870 is for non SMC only.
In my opinion, by 73, GM was experimenting with a first generation SMC. The panels were no longer being made by Rockwell and weren't the same as the "White","Black" or "Grey" FRP press molded panels on the 53-72 Corvettes.
870 may well work for George's application.

Dan

 

[shine]

have not used the adhesive 994 for a filler. my next car i will be using either quantum epoxy hybrid or i will be using the west epoxy 105 system . trying to get away from polyester altogether.