Powder coating - Aurum / Vaz / Armourtex / Respray gallery

Just got this back from Armourtex.

RAL 5012 no clear coat = £49
/attachments/12200
The frame had some really heavy rust and pitting, so some of this has come thru - nothing could really be done about it tho.
/attachments/12199
Overall really happy, v quick and helpful.

I'm curious about this. I've a frame that really needs a respray so I plan to take it to Armourtex, but it's fairly badly rusted and has been overpainted with brushed blue gloss. From the brochure it sounded like the powdercoating process would burn off old paint and corrosion, and I thought the it would cover up most blemishes, but ought I strip the paint and give the frame a rub down before taking it in? Any ideas?