Discovered a small bubble/ glue failing on my dash a little while back, about the size of a dollar bill folded in half.
Bought some leather adhesive a couple months ago to redo my gauge pod cover that has the same issue
Glue
https://www.amazon.com/gp/product/B09FF4PD4Q/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Heated the glue with a heat gun so it'd flow from the syringe for about 3 min
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I unscrewed the needle from the syringe so I could pull in some glue. Tried without the needle off and no go.
Needles
https://www.amazon.com/gp/product/B0B63Q7TR2/ref=ppx_yo_dt_b_asin_title_o00_s02?ie=UTF8&psc=1
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Injected all the adhesive into the leather bubble
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Then rolled it smooth with a MF towel under the roller. The roller is urethane and has hard edges, it will mark the leather if you don't use a towel
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After rolling
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Cleaned up the spot with some IPA (4:1) I have then applied some leather conditioner
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Its sitting in the sun and its 60° out today so that should help cure the glue in a few hours with the windows up.
This has worked well in the past when I did my gauge pod cover but I used dap weldwood there, decided to try the Duaal 88 after researching some leather dash restoration websites