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dashboard is also some kind of magic slippy plastic
There's your trouble. You really need to identify what kind of plastic and use an appropriate activator to get the glue to stick, e.g. https://www.permabond.com/wp-content/uploads/2016/04/POP_TDS.pdf for polypropylene. After that, you can use a regular cyanoacrylate super glue; don't us the rubber toughened one, the brittleness of regular will be your friend when you need to pop the accelerometer off the dash.
Glue only half the area of the bottom of the metal cube and use the curvature to your advantage to leave a gap under the non-glued section into which you can insert an ice scraper when it comes time to pry the two apart.
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I would try Gorilla All Conditions Sealant. https://uk.gorillaglue.com/gorilla-all-conditions-sealant-clear/ Does all kinds of things. I'd also try a hot melt glue gun. There are various glue sticks available, including some specialist industrial ones which might adhere to your dashboard.
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gbj_tester
nick_h.
@Cupcakes
What's a really strong, stiff adhesive that comes off with known and readily available solvent?
The situation is I need to mount an accelerometer to the dashboard of my car. It is a metal cube of about 20mm on each edge. It's pretty heavy for its size.
So far I have tried: adhesive velcro; Bostik sticky dots; double-sided adhesive tape; and adhesive foam.
The foam worked best but wasn't sticky enough. What was good about it was that it had some thickness and compressibility, which meant that it filled the gaps nicely between slightly curved dashboard and flat base of sensor.
The dashboard is also some kind of magic slippy plastic material.
Help?!