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Even if they are freshly cut pieces not grinded but cleaned before being put in the kiln

Thanks

Thanks for responses In relation to the mucky lines they show a fine line round the whole piece straight, like an outline . Not always around the whole thing. They come out nicely formed With the kiln wash, there are no lines so don't think it's a grinding thing. Can't understand why the paper would...

Need some advice. :D New to it I used to use Thinfire paper when fusing my glass but got like mucky lines around the fused glass. Looked into it and change to using primo primer instead but the glass on the bottom side has rough and sharp edges which I never got with using the paper. I apply 5 coats...