Yes, these are weird words to put in a forum post.
I'm in the UK, I'm going to see a friend in the EU next year for some messy fun, and I'm contemplating the best way of getting gunge powder from A to B. As I see it my options are:
1. Order from supplier (in the UK) straight to the EU
2. Order from supplier to me and post
3. Take with me in checked luggage
4. Take with me in hand luggage
Has anyone tried any of these before, and with what success? 1 and 2 are safer but more expensive, also don't particularly want to get patted down in a busy airport for security to find a few kilos of white powder, people might get the wrong idea.

I'd recommend not taking it in your hand luggage. It WILL be taken out if your bag and asked about. You may have to sit in a room until the "powdered substance" is verified.

Checked luggage worked fine for me

i ordered a few times from messya supplies to EU
Costs a bit more though

If you bring it in your carry-on, you may be stopped for suspicious amounts of powder explosives and have your bag opened and it all getting swabbed (but still be allowed to take it after some public embarrassment)

Checked, they'd probably still flag your luggage, but since it's nothing illegal, you would still theoretically get it.

Edit: I made the mistake of carrying large amounts of powder J-Lube in clearly labeled bottles in my carry-on and got stopped and baggage searched. Some of the security people were professional about it, others were not.

i think international shipping would save you the most hassle if shipping costs aren't prohibitive.