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SEM High Build Primer Surfacer Gray Aerosol is rated 4.4 out of 5 by 5.
Rated 5 out of 5 by from Smooth Primer I have been using a different high from Eastwood, I have been happy with it but it tended to be chalky but covered very well with a thick build. When I switched to this High Build I was blown away, Using a over lap pattern this primer goes on smooth and thick. I intend to use this as a base before laying down the base coat.
Date published: 2013-08-11
Rated 5 out of 5 by from Top quality SEM primer is the exact primer I was getting from the pro paint shop, which cost more plus the drive to and from. Now it is delivered to my home andcosts less!
Date published: 2013-07-23
Rated 4 out of 5 by from Got ya' covered Sem high build primer fits the bill when you dont' want the hassle of cleaning up your spray equipment. Goes on smooth and covers well. Sanding is a breeze too!
Date published: 2014-12-09
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Sanded to bare metal an entire '00 Volvo S40. I then used the SEM 42003 Black High-Build Primer over the bare-metal car. Has this been a mistake? Do I need to sand off $150 and re-shoot with 2k Primer? What issues could I experience if I leave it HB?

Asked by: JustAnOldCoot
While there technically wouldn't be an issue having high build on the vehicle the problem is on an over all paint job you would want to use with Epoxy primer or self etch as your base primer for ultimate strength.
Answered by: Scott C
Date published: 2018-07-24

How many cans would it take to cover a 1978 El Camino

Asked by: ISAIAH
Since each can covers approximately 15 SQ FT it would probably take 10-15 cans to cover the exterior of a vehicle. Since this is a non-catalyzed product it would not necessarily be the best option for durability. Our 2K urethane primer surfacer would be an automotive grade primer in a spray can.
Answered by: Scott C
Date published: 2018-07-05

Can this be used over Eastwood Rust Encapsulator and then top coated with Eastwood Underhood Black? I am looking to cover pitting on Radiator Support, Headlight Buckets and the like. Thank you.

Asked by: 73 Blue RT
You can certainly apply this product over our Rust Encasulator to allow you to block sand the area smooth in preparation for our underhood black.
Answered by: Scott C
Date published: 2018-06-01

Will this stick to bare plastic ?

Asked by: Lizkid
This will adhere to properly sanded and cleaned plastic.
Answered by: Scott C
Date published: 2018-04-30

Does this come in black ?..

Asked by: Scottjg
We only carry the SEM high build in a gray color.
Answered by: Scott C
Date published: 2018-03-22

Can body filler be applied on top of this primer?

Asked by: DonP_71
We do not recommend applying body filler over a non catalyzed primer such as this. The only one we sell you can do it over is our Epoxy primer.
Answered by: Scott C
Date published: 2017-12-14

Can this product be used on fiberglass? If so, does the fiberglass need to be prepped in some way before using?

Asked by: ChrisAllen
This can certainly be used on fiberglass. Just sand the surface with some 320 grit to put some scratches in for this to adhere to.
Answered by: S Church
Date published: 2017-10-02

Can I spray urethane color base coats directly on to this without sanding within a certain time frame?

Asked by: JAZE101
Since this is a high building primer it is designed to be sanded prior to color coat to achieve proper film build.
Answered by: S Church
Date published: 2017-08-09
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SEM High Build Primer Surfacer Gray Aerosol

SEM High Build Primer Surfacer Gray Aerosol

Item #50056Z Brand: SEM

Touch-up surface imperfections before priming and top-coating
Quantity: close

Out of stock

Only $20.99
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SEM High-Build Primer Surfacer provides superior adhesion with fast film build and flexibility

  • Provides superior adhesion
  • Excellent filling properties
  • Works on flexible or rigid substrates
  • Easy to sand
  • Topcoat with most refinish material

High-Build Primer Surfacer is a flexible acrylic coating for priming steel, aluminum, urethane, fiberglass and plastics.

If you've ever block sanded down to bare metal, here's an easy way to touch up. The SEM High Build Primer Surfacer provides superior adhesion with fast film build and flexibility when priming steel, aluminum, urethane, plastic and other similar surfaces. Sands easily with 320 - 400 grit. One 16 oz net wt. aerosol can covers about 15 square feet.

More info...
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One 16-oz. aerosol can of SEM High-Build Primer Gray


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Click here for Safety Data Sheet

Attention California Residents - Proposition 65

Proposition 65 Warning WARNING - Cancer and Reproductive Harm -

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