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View Poll Results: Which self etching rattle can primer do you prefer?
Napa 7220 23 32.86%
Mar-Hyde 5111 3 4.29%
SEM 13 18.57%
Tempo 2 2.86%
Sherwin Williams 988 9 12.86%
Other (Not listed, "Epoxy is all I use", etc.) 20 28.57%
Multiple Choice Poll. Voters: 70. You may not vote on this poll

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Old 03-18-2017, 09:50 PM
sibriggs sibriggs is offline
Join Date: Nov 2014
Location: Concord, NH
Posts: 124
Default Rustoleum from Home Depot

If you haven't tried the self-etching primer from Rustoleum sold at home depot and lowes you should. I found it to be much better in a number of ways.

It goes on smoother, sticks better and lasts longer. I've been using it on aircraft restoration projects for years. Some of the Sem and NAPA primers cause certain cover coats to wrinkle this one doesn't.

It works great on both steel and aluminium, drys fast and applies nice.

And no I don't have stock in the company.

Steve Briggs ATP, CFII, A&P, IA
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Old 03-19-2017, 01:33 AM
longline longline is offline
Join Date: Sep 2014
Location: silverdale, WA
Posts: 196
Default SEM works for me...

but I have found some paints wrinkle when top coating SEM. I have not figured out what is causing this, but suspect application issues rather than a problem with the SEM itself.
Generally, SEM appears to be rugged and fast drying. I like it, and will continue using it for the interior as it is easy to touch up any areas that show wear.
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Old 03-19-2017, 07:36 AM
agirard7a's Avatar
agirard7a agirard7a is offline
Join Date: Aug 2009
Location: Newport, RI
Posts: 623
Default Nappa vs SEN

I've used both Nappa and SEM. In my experience, Nappa self etch did
Not adhere as well, scratchs off easily
and is not as durable as SEM. Also, over steel, they both will
rust through. Epoxy is by far the best way to go over steel. Also use epoxy on high wear areas.
Al Girard, Newport, RI
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Old 11-15-2017, 09:21 AM
SteveT SteveT is offline
Join Date: Oct 2017
Location: Scottsdale, AZ
Posts: 17

What are you using to clean/prep the surface before applying the NAPA or SEM rattle can primers?
Steve Thompson
Scottsdale, Arizona
RV-14 #140437 - building the empennage
N45KK reserved
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Old 11-15-2017, 02:07 PM
BobTurner BobTurner is offline
Join Date: Dec 2011
Location: Livermore, CA
Posts: 5,018

Originally Posted by SteveT View Post
What are you using to clean/prep the surface before applying the NAPA or SEM rattle can primers?
My paint shop (SEM) recommended:
Scuff with red pad
De-grease/clean with water and Dawn dish soap
Water rinse
Vinegar etch
Water rinse (water should sheet)

This seemed to work pretty well. I tried skipping one or more steps on scrap; paint didnít adhere as well.
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