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Lacquer over polished aluminium

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A100man
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PostPosted: 15:24 - 15 Apr 2021    Post subject: Lacquer over polished aluminium Reply with quote

Hi All

Got a couple of jobs where I'm looking to ad some decals over polished ally then lacquer over the top. Solvol autosol leaves a residue so I'm proposing a wipe down with brake cleaner or acetone beforehand. does that sound OK?
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c_dug
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PostPosted: 15:33 - 15 Apr 2021    Post subject: Reply with quote

I've used pure/99% IPA before on polished brass and it worked perfectly.

This sort of thing: https://uk.rs-online.com/web/p/electronics-cleaners/2274427/?cm_mmc=UK-PLA-DS3A-_-google-_-CSS_UK_EN_Facilities_Cleaning_%26_Maintenance_Whoop-_-Electronics+Cleaners_Whoop+(2)-_-2274427&matchtype=&pla-299936613816&gclid=Cj0KCQjwyN-DBhCDARIsAFOELTlfpl--kPXunhZyd-Sk-N83b4GQ4KEys8oyU81vWE0MufQYX_ssu-EaAmf7EALw_wcB&gclsrc=aw.ds

Pretty sure you can buy actual surface prep wipes specifically designed for the purpose, never looked but I'd bet they're IPA based anyway.
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MCN
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PostPosted: 18:55 - 15 Apr 2021    Post subject: Reply with quote

Aluminium needs an 'acid etch' (really) to ensure the paint doesn't slough off.

Normally the acid etch has a pigment to let you see where it is.
But the chemical is probably available as a clear coat.

Aluminium and alloy is normally overpainted after smoothing but acid etched before any primer is applied.
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Islander
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PostPosted: 21:56 - 15 Apr 2021    Post subject: Reply with quote

MCN wrote:
Aluminium needs an 'acid etch' (really) to ensure the paint doesn't slough off.

Normally the acid etch has a pigment to let you see where it is.
But the chemical is probably available as a clear coat.

Aluminium and alloy is normally overpainted after smoothing but acid etched before any primer is applied.


Yep this^^

Aluminium has a very high affinity for oxygen and oxidises rapidly (the oxide actually protects the surface from further reaction). The layer of oxide is what prevents paint from adhering properly.
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