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Once you have reached 145 degrees celcius, you will use a mini flat head screwdriver to remove the sealant. Not a good idea to use a razor blade for doing this because if you accidentally dig into the motherboard, you could rip or break one of the traces on the motherboard that run under the GPU (there are Hundreds). Carefully hold the mini-screwdriver at a 45 degree angle and immediately after taking the heat away from the chip, you want to begin scraping away the chip sealant.

Nvidia chipsets will mainly use the red glue, and the amount will vary. Some will apply it in dots around the chip, some just at the 4 corners, and some will use the sealant the whole way around. Apply slight pressure to start the scraping/peeling of the red epoxy… do not ―digǁ… you want the screwdriver as flat and parallel to the chip/motherboard as you can get to help prevent scraping of the board or chip. If you have reached the right temperature, removal should be easy, as it should ―peelǁ right off and away. Do not dig under the chip as you can damage the connection or cause thermal spotting; especially if you wedge any epoxy under it.