what glue to use?

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what glue to use?

Postby ShaBro » Wed Apr 30, 2014 4:36 pm

I've just ordered some rubber off the roll for my firenza rear window, but I'm just wondering if anyone would know whats the best stuff to bond the corners?
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Re: what glue to use?

Postby viva les vegas » Wed Apr 30, 2014 11:27 pm

Don't know for sure, but I might be tempted to use the stuff they use to bond windscreens in with. Believe it's got a certain amount of flex in it, and is quite sticky when it comes to gluing :-) Might be worth popping in to a local windscreen fitter if no one else suggests something different.
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Re: what glue to use?

Postby thomas » Thu May 01, 2014 2:46 am

A post on the dsg forum reported good results with superglue, but I wouldn't chance ordinary pound-shop superglue. The poster there had used a Loctite cyanoacrylate formulation Loctite 495, specifically made for rubber and plastics and coincidentally usable too for potable (drinkable) water systems, piping joints and so on, so is likely to be durable in the presence of moisture/rainwater too, which more ordinary stuff might not necessarily be in the longer term.

Remember the golden rule, measure five times, cut twice, or something like that; an inexpensive (99p) mitre block in which the rubber can sit closely might be very useful if accurate rather than approximate 45 degree angles are your goal, I think on the HB rear, the angle at the bottom corners is slightly less than 90 degrees, I'm unsure about the Firenza, but think like the HB it'll be so slight as to be able to get away with it.

I've seven and a half metres of correct profile rubber to do front and back screens on my HB and bottle of the above glue but I'm dreading tackling this job and constantly finding other things to do instead, on top of that the headlining is so brittle and fragile around the back window pillars too, that it adds more terrors. I recall with tears in my eyes someone on here snapping up an HB headlining (condition unspecified) for £4 from another member on here, for their GT resto I thought, but subsequently having a new one made for the GT, which means they might still have that first one and might surrender it to my pleas, unless it was in less than ideal condition or unusable.

Good Luck. You might try tracking down the dsg post, in all probability the Firenza owner there is a member here too and can fill you in on the details, tips and the durability of such glued joints in service.
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Re: what glue to use?

Postby ShaBro » Thu May 01, 2014 10:30 am

Thanks, that's very useful
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Re: what glue to use?

Postby StefanM » Thu May 01, 2014 5:44 pm

3M used to make a purposemade glue but I do not know if it is still available.
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Re: what glue to use?

Postby 1972nail » Thu May 01, 2014 10:12 pm

The rubber will shrink in cold weather so a good tip is to pre-shrink it before measuring and cutting by storing it in the freezer overnight. If you don't then there is a chance of the corners opening up in the winter.
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Re: what glue to use?

Postby ShaBro » Fri May 02, 2014 11:23 am

Thanks David, that's a bloody good idea. I have spoken to someone on the phone recently and they recollected that the dsg had some made up at some point that had split, I wonder if that was the reason?
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Re: what glue to use?

Postby escort89 » Fri Jul 04, 2014 6:45 pm

How did you get on with the rear seal?
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Re: what glue to use?

Postby ShaBro » Fri Jul 04, 2014 11:47 pm

I haven't actually managed to do the seal yet but I have done some test pieces using a couple of different glues.
The best so far has been a permabond superglue with a primer. I'm not sure of the particular specs as it was brought to me by my father from an engineering shop, and said that he used it regularly on rubber o rings in the workshops
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