posted this a while back
I fixed it up , its really good again
I used Quikcrete Fast Drying cement. The instructions on it are terrible. You need to mix it in a pail first. I don't know if I would recommend this product again for doing huge chunks, I think using proper slow drying cement would have been better. It is a tiny bit chalky / dusty, but it definintely does work.
I found if I spray lacquer it after it dries, it kind of seals in the dust and then holds it all together and you grind right through it no problem. Have hit many sessions on it and it seems fine. Theres a few spots I could have done a bit more and I might need to go over again later cause sometimes i get caught on them, but for the most part I am grinding through it no issue and not even thinking about the chunks at all ,especially around the bend.
I did another spot
this one i did a better job on as I had more idea what I was doing. will get some better pics later but I posted up a clip of me bs 5050ing the whole thing. It had huge chunks out of it as well and it looks awesome now. there is 1 spot where it didnt work good cause i think my friend hit it too early before lettting it dry and chunked it a bit... but i think it doesnt even really matter it was such a small chunk. smaller cracks this stuff works a lot better on.