I made a test with LET for comparison to Plasti Dip.
I applied the LET in a very thick coat. After 1 1/2 to 2 hours, I applied a second very thick coat. I took a photo of the coat in place about 9 hours after the second coat had been applied. I could still smell the aroma somewhat, but the LET was solid and firm. I removed it and took another photo.
Before the application, I applied a thin layer of Vaseline to the gold-colored component that is toward the top in the photo and a layer of painter's tape to the gold-colored component that is toward the bottom in the photo. There were paper labels with the name "Samsung" affixed to the tops of both of the components (you can see them in the pics above), which I covered with the LET (the layer of Vaseline or the painter's tape in between).
The photos here are BEFORE application and AFTER removal of LET.
The LET was as tightly adherent to the card as the Plasti Dip had been, if not moreso. It took a lot of force to pull it off. The difference, however, was that it pretty much came off in a single layer, with just a few spots needing a little more work, whereas the Plasti Dip kept pulling apart from itself and breaking into pieces. The LET even adhered tightly to some of the the residual Plasti Dip that I hadn't been able to peel out of the crevices before, and almost all of it came up with the LET. It may be that if I had applied thicker layers or several more layers of Plasti Dip during the Plasti Dip test, that problem of the Plasti Dip breaking into pieces could have been avoided (the LET coating ended up being a lot thicker than the Plasti Dip coating had been).
The LET peeeled off both of the gold-colored compents very easily, but even more easily on the painter's tape side than on the Vaseline side. I couldn't see any Vaseline residue once the LET had come off. However, the paper label got peeld off on the Vaseline side along with the LET, but it stayed put underneath the painter's tape. A key observation, since keeping those labels intact might be important for warranty service or resale value.
Based on this I will be treating my next GPU with LET, covering the areas I don't want to have a problem getting it off later, such as on the "warranty void if removed" labels, with painter's tape.