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Adhesive for aluminum to aluminum or steel to aluminum?

I need to fix a sign weighing 15 kgs. to an aluminum window frame (3 Mullions). Sign is 2200 x 700. I was hoping to stick the brackets with an epoxy .Last resort is to use rivets through the mullions.Any suitable adhesive agent or epoxy please. Brackets can be made of steel if this will adhere more effectively. My worry really is adhesion to the actual aluminum frame.

Barra o' brien
construction and design - Mallorca, Spain
2006

You can use any good epoxy-but you must pretreat aluminum with some etchant(10% NaOH!?) or conversion coating(30 sec. with 1 gm tannic acid ⇦ on eBay or Amazon [affil links] /1 lit water,50 °C temp. is simplest solution-according to one US patent,try www.uspto.gov/ site for more infos). I think that riveting or soldering is better. Good luck!

Goran Budija
- Cerovski vrh Croatia
2006

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