which primer for moulds?

[Lucas]

I have bullseye shelf primer, which I seem to have got the hang of for the shelves, but I have a mould and a fused piece all ready to go but am womdering about priming the mould...
It's only a little one (hang on, I'll try and get the link)...http://www.warm-glass.co.uk/extra-small-square-slumper-with-flat-base-p-2979.html
and since I have bullseye primer and primo primer
http://www.warm-glass.co.uk/primo-primer-p-2808.html
...I don't know which to use!  Obviously the kiln isn't going to be as hot as a full fuse, and I want to minimise the number of times I have to un prime the mould (if that makes sense!).  I use a paint scraper on the shelf which works fine, but would obviously not be good for the mould, so I think I'm leaning towards the primo - and thoughts/suggestions/advice/recommendations?
L

[ARBeads]

We went on a days course with the lovely Dawn (Zeldazog) and primo is the way to go with the molds. We'd already tried the shelf primer and failed - result one glass heart that refuses to budge.

[Zeldazog]

Previously, I've always used Bullseye primer for moulds, probably mainly because Primo didn't exist when I got them!

You're right, they don't go anywhere near as hot - and as a result, you shouldn't get issues of flaking like you do with a shelf.  I think I have only re-coated the most used mould once since I bought it, 3 years (and several firings) ago.  I didn't try and take the original layer off, I simply applied more, so I think removal is only an issue once you get broken edges on the primer.

This all said, if you have Primo, I'd be tempted to use it as it *is* designed to go higher anyway.

[Sarah A]

I have the same mould and have coated it with bullseye as it was the one I had.  It has been fired at least five times since I first coated it and is still fine.

[Lucas]

Thanks guys, okay, moulds have been coated with the primo this morning, and I will be turning on the oven first thing tomorrow - figure 24 hours should be enough drying time!  Will let you know how it turns out - I'm wanting nice evenly slumped glass, easy to get out of the moulds, and moulds that still look primed (and in one piece obviously!)  Wonder what my chances are...!

[Lucas]

All three pieces came out looking really good, so I am exceptionally pleased with myself, to the point of even feeling a little bit smug!


However.....

All three moulds now look a little dusty (no primer on the glass at all), and I'm trying to work out of the primer is still on them or not - I know it may sound daft, but the moulds are ceramic and sometimes the colours confuse me.  So, do I need to brush them out and re-prime, or can I use them again without re-priming? (I know that probably isn't a real word, but I figured you'd know what I meant!)  I don't want to wreck the moulds (obviously) but also don't want to waste time/energy/money putting primer on moulds that don't need it!!

See how long my smug moment lasted there?  Not very.

L