I've used this type of resin before, so I'm familiar with how it works. Apply resin according to the instructions, cover with plastic and set fire to it. However, if you withdraw the plastic. All the resin comes out of the crack. This applies to small scratches, chunks and cracks. Even if you skip the plastic, the razor blade will rip it out. After playing around with it and trying a few times, I eventually slowly built and removed the infill until my repair was complete. That's why I put two stars, it solved the problem. But it wasn't as easy as billing and it required adjustments to work.
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