Etch primer for aluminium

[wristpin]

Ive got a couple of cans of U-Pol etch primer which I've only ever used on steel . Will it be ok for a cast alloy air cooled engine cowl ?

 

[brightspark]

Ive got a couple of cans of U-Pol etch primer which I've only ever used on steel . Will it be ok for a cast alloy air cooled engine cowl ?

yes rough it up a bit to get a better key as well if possible

 

[richie00boy]

Be fine as long as they are not old cans. The acid weakens over time.

 

[wristpin]

Thanks, will bead blast it and the cans are less than a year old so with the sun shining it's all things go!

 

[brightspark]

Thanks, will bead blast it and the cans are less than a year old so with the sun shining it's all things go!

beads peen the surface and make it smooth .blasting with fine abrasive etches the surface and gives a good finish for coating . a well known bag of dried yellow abrasive from wickes is perfect on ally