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I am making a rainbow dinner set and am to the slumping stage. The dinner plates and side plates have come out great, but two bowls I did yesterday have got rough top edges (https://www.dropbox.com/s/tsja1cmevmw42 ... l.jpg?dl=0). They are going into Slumpys molds and I used the Slumpys recommended firing schedule for a deep slump using Bullseye glass in my Evenheat Studio Pro 41, as follows:

Seg 1 : 150, 300, 15 mins
Seg 2 : 300, 1150, 20 mins
Seg 3 : 150, 1360, 40 mins
Seg 4 : 400, 900, 60 mins
Seg 5 : 150, 800, 10 mins
Seg 6 : 300, 100, 0 mins

I did one using the recommended Evenheat schedule for slumping and they came out with virtually no patterning on the underneath side at all.

What do I need to do to fix this? Refire to flatten them out and start again? If so, what schedule to use?

Thanks for help,
Vicky

Did you apply any kiln wash to those molds? It sure doesn't look like it, as the glass has really grabbed on to the edge of your molds.

I doubt you're going to pick up the texture of that mold. I've seen others ask about it in the past and I own two; I've slumped into them quite a few times and just consider them plain bowl molds since I never get any texture out of them. Perhaps if you fired hotter/slower but you run the risk of the edges dragging like you've got.

I'd kiln carve the design first, then slump into some better quality molds.

1360 is pretty hot for a slump.

And I agree with Valerie about the mold. I have it and find it basically worthless, at least as far as trying to get texture onto the glass.

Dana W.

Thanks for your comments. Yes I have 4 coats of kiln wash on the molds and the design is really good/clear on the glass. Should I try more kiln wash and lower top temp? If I full fuse the bowl do you think it'll go round and flat or am I going to end up with another problem?

Thanks, Vicky

as the heat has undoubtably caused the glass to stretch, when you flatten it, it won't be round or even again, but distorted.

you can either start over, or use a large flat lap to grind down the edge to make it even. you'd have to do this to all the bowls to make them match.