Strudul Posted February 1, 2017 Share Posted February 1, 2017 (edited) Edited- Looking to mount aluminium (probably painted, but I can leave it raw on the connecting side if that helps) sheet to glass (rear window). Requirements: - Strong enough to never fall off - Removable (doesn't have to be easy, just possible, and without leaving any marks) - No damage to the glass or the aluminium (or the paint on the aluminium) - Low profile Was going to use 3M tape, but have been persuaded otherwise, and an adhesive sealant is sounding like a better option unless someone has any other ideas. Old Post: Any 3M tape experts? Looking to mount aluminium (probably painted, but I can leave it raw on the connecting side) sheet to glass (rear window) with some double sided tape. Most automotive forums seem to recommend 4229P, however from the data sheet, the adhesives on this tape are AR-7 and DS-4, which are designed for "clear coat paints" and " automotive plastics". There seems to be a billion different products to choose from, but from what I can deduce, I'd be better off with something from the 4941 family, either 4941 or 4936? Or PT1100??? Any suggestions or advice appreciated. Cheers Edited February 2, 2017 by Strudul Quote Link to comment Share on other sites More sharing options...
Ekona Posted February 1, 2017 Share Posted February 1, 2017 I wouldn't use any tape to bond anything there at all, it just doesn't have anywhere near the required strength. I assume you're attaching some louvres to the rear glass? Just use TigerSeal, or even better Sikaflex 29i instead. You really, really don't want that flying off at speed. 2 Quote Link to comment Share on other sites More sharing options...
Strudul Posted February 1, 2017 Author Share Posted February 1, 2017 How removeable are those if the need should ever arise? Quote Link to comment Share on other sites More sharing options...
Ekona Posted February 1, 2017 Share Posted February 1, 2017 It takes effort and a good solvent and a lot of time, but doable. Not an easy job by any means though. Quote Link to comment Share on other sites More sharing options...
Strudul Posted February 1, 2017 Author Share Posted February 1, 2017 I assume it won't damage glass / aluminium, but won't be very kind to paint? Quote Link to comment Share on other sites More sharing options...
Ekona Posted February 1, 2017 Share Posted February 1, 2017 Fine on both, but you just need to be a bit more careful upon removal if it's on paint. No sharp knives etc. Quote Link to comment Share on other sites More sharing options...
Flex Posted February 1, 2017 Share Posted February 1, 2017 How about lard, warm it up and apply and only drive when really cold? Quote Link to comment Share on other sites More sharing options...
Strudul Posted February 2, 2017 Author Share Posted February 2, 2017 How about lard, warm it up and apply and only drive when really cold? Good shout, though after some serious brainstorming I think toffee would be a better solution, as when it comes to removing it, toffee tastes better than lard when being licked off. 1 Quote Link to comment Share on other sites More sharing options...
Strudul Posted February 2, 2017 Author Share Posted February 2, 2017 (edited) Would you recommend Sikaflex 291i over all the others (221, 512, EBT)? EBT seems to be the only one stocked in stores. What about CT1 instead? Also would it still be effective when spread thinly? Edited February 2, 2017 by Strudul Quote Link to comment Share on other sites More sharing options...
taybo Posted February 2, 2017 Share Posted February 2, 2017 I fitted mine last week with clear silicone. Stuck on fine and has had a good run up the M5. What make of louvre are you fitting. I've had a few issues with the 'slats' rattling against the glass! Quote Link to comment Share on other sites More sharing options...
Ekona Posted February 2, 2017 Share Posted February 2, 2017 I've used the 29i before, hence the recommendation for that one. EBT would be okay as well. No experience of CT1 to comment. Depends on what you mean as 'thinly'. You need a good even coverage, but there's no point in either slapping it on and watching it squeeze out everywhere only for you to wipe it all off, but nor is it a good idea to have it so thin that you have poor contact between ally and glass. Quote Link to comment Share on other sites More sharing options...
Ekona Posted February 2, 2017 Share Posted February 2, 2017 I fitted mine last week with clear silicone. Stuck on fine and has had a good run up the M5. Clear silicone will definitely have the sticking power once dry, but doesn't have the mould repellent that the 29i or other marine adhesive has. Quote Link to comment Share on other sites More sharing options...
Strudul Posted February 2, 2017 Author Share Posted February 2, 2017 I fitted mine last week with clear silicone. Stuck on fine and has had a good run up the M5. What make of louvre are you fitting. I've had a few issues with the 'slats' rattling against the glass! Custom Try running a rubber / foam strip along the edge of the slats where they touch the glass? Quote Link to comment Share on other sites More sharing options...
Strudul Posted February 2, 2017 Author Share Posted February 2, 2017 You do mean 291i, right? Can't find 29 anywhere... Just thinking about removal, how would you attack it with a solvent if it's behind something (green)? Can you just do a strip along the edge instead (red)? (blue = glass, grey = aly, red/green = sealant) Quote Link to comment Share on other sites More sharing options...
Ekona Posted February 2, 2017 Share Posted February 2, 2017 My typo, yes the 291i. Well you have to get something between the two surfaces first to separate them, then you use the solvent to dissolve. Think of it like debadging a car with some floss, only on a bigger scale. You cannot and should not use the red method you show there, as you won't have anywhere near the contact patch required to hold it down: That's for sealing, you want to bond. 1 Quote Link to comment Share on other sites More sharing options...
Strudul Posted February 2, 2017 Author Share Posted February 2, 2017 Ah, righto. Looking through the Screwfix catalogue, Sikaflex comes under sealant rather than adhesives. Would something like this Evo-Stik be better or too strong and impossible to get off? Quote Link to comment Share on other sites More sharing options...
Ekona Posted February 2, 2017 Share Posted February 2, 2017 You really don't want to be using that. Trust me, the Sikaflex stuff is what you want, it's got more than enough adhesive power. I stuck my lexan window into the MR2 hardtop with that, and it did the job perfectly. Quote Link to comment Share on other sites More sharing options...
Stutopia Posted February 2, 2017 Share Posted February 2, 2017 Might be worth popping in to a local body shop. At least then they should have insurance if your rig decapitates a innocent convertible driver on the M1. I can't image they'll charge you much just to stick it on. Edit: all my aftermarket bits (diffuser, spoiler, spats) the body shop used sicaflex. They don't budge a centimetre. Quote Link to comment Share on other sites More sharing options...
Ricey Posted February 2, 2017 Share Posted February 2, 2017 Seriously Mammoth tap from toolstation. It is unbelievably strong. Sent from my SM-G925F using Tapatalk Quote Link to comment Share on other sites More sharing options...
Strudul Posted February 2, 2017 Author Share Posted February 2, 2017 Seriously Mammoth tap from toolstation. It is unbelievably strong. Sent from my SM-G925F using Tapatalk Surely along the same lines as the 3M stuff? Can anyone really guarantee that if the wind gets under it at 130mph it won't pull it off? Quote Link to comment Share on other sites More sharing options...
LAL350Z Posted February 2, 2017 Share Posted February 2, 2017 I would use the stuff they put windscreens in with personally! if you get the primer they use as well its ridiculous! Quote Link to comment Share on other sites More sharing options...
Ricey Posted February 2, 2017 Share Posted February 2, 2017 Seriously Mammoth tap from toolstation. It is unbelievably strong. Sent from my SM-G925F using Tapatalk Surely along the same lines as the 3M stuff? Can anyone really guarantee that if the wind gets under it at 130mph it won't pull it off? Seriously buy some just to have in the house anyway and give it a go on something else first. Its vicious! I nearly pulled my finger nail off with a bit once. Sent from my SM-G925F using Tapatalk 1 Quote Link to comment Share on other sites More sharing options...
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