escalantea
Member
This is not about "should I Prime or not". More about selecting a Primer.
I wanted to use a "shake can" primer (convenient), so I tested 8 different ones.
I sprayed on a clean piece of AL skin (no special treatment or scrubbing, just remove the blue vinyl), let it sit for 3 minutes and did a touch test, so see if it was quick to dry.
After ~10 minutes I did the "fingernail scratch" test, 24 hours later I repeated the scratch test.
The winners are the ones that dried quickly and resisted the fingernail scratch test completely, no scratch.
All the others (5) did not get close. The winners dried very quickly and resisted the scratch test, no matter how hard I tried!
If someone wants the image of all 8 test candidates, please email me, I will send back.
I hope this helps.
I wanted to use a "shake can" primer (convenient), so I tested 8 different ones.
I sprayed on a clean piece of AL skin (no special treatment or scrubbing, just remove the blue vinyl), let it sit for 3 minutes and did a touch test, so see if it was quick to dry.
After ~10 minutes I did the "fingernail scratch" test, 24 hours later I repeated the scratch test.
The winners are the ones that dried quickly and resisted the fingernail scratch test completely, no scratch.
- The clear winner is SEM PRIMER SELF ETCHING PRIMER (~$20 per can)
- Followed [very] closely by Rust-OLEUM Professional Aluminum Primer (lowest cost)
- Then Majic Fast DRY SELF-ETCHING Primer
All the others (5) did not get close. The winners dried very quickly and resisted the scratch test, no matter how hard I tried!
If someone wants the image of all 8 test candidates, please email me, I will send back.
I hope this helps.