Item # 50056Z BRAND: SEM

SEM High Build Primer Surfacer Gray Aerosol

Touch-up surface imperfections before priming and top-coating
Touch-up surface imperfections before priming and top-coating
SEM High Build Primer Surfacer Gray Aerosol is rated 4.4 out of 5 by 5.
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Touch-up surface imperfections before priming and top-coating

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SEM High Build Primer Surfacer Gray Aerosol

Product Overview:

Description

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.

In the Box

Contents

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

Guides & Accessories

Reviews

Rated 4 out of 5 by from Would Recommend Fills very well and sands easily.
Date published: 2014-06-13
Rated 4 out of 5 by from Sem High Build Primer Great Product This Primer sprays from the can ,like it was coming from a spray Gun!! Very good flow with minimal runs! Have used it on my antique '41 Buick, and '54 Lincoln! I recommend it to all my friends that have Antique Cars & Trucks! Great Stuff! Need to have Quantity discount! Thanks Eastwood!
Date published: 2011-01-15
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Questions & Answers

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: 2020-03-29

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. https://www.eastwood.com/2k-aerospraytm-high-build-urethane-primer-gray-black.html
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

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

For spot repairs, can this primer be applied over existing automotive finishes, and/or body filler, and glazing putty?

Asked by: Indian mb
This can certainly be applied over top of all you have listed as long as properly scuffed first.
Answered by: S Church
Date published: 2016-12-09

Can I spray this on top of SEM Self-Etching Primer?

Asked by: RAZE
This can certainly be used over SEM Self-etching primer.
Answered by: S Church
Date published: 2016-10-04

high build doesn't seem to be sticking to bare metal. Does temp affect it sticking?

Asked by: bkillea
Temperature will definitely affect paint adhesion. We always recommend to have the outside temperature along with the substrate you are painting up to at least 70F.
Answered by: S Church
Date published: 2016-04-10

Can I spray this directly onto the SprayMax 2K epoxy also sold on Eastwood's site? 

Asked by: Arthur56
You can use this over the cured and prepped epoxy with no issues, but it's far better to stick with catalyzed automotive primers through the whole project if that's the way you're starting. The 2K Aero Spray Urethane Primer will be far better to use over the epoxy primer.
Answered by: MikeL
Date published: 2018-03-04

Great product, sprays like a gun/builds thick...sprayed my entire truck with it after filler and prior to blocking. Do I need to have my painter spray another primer/sealer (epoxy?) before base coat? Thanks!

Asked by: jbs art shack
The use of a sealer will depend on the paint system you're using - some require a sealer, some do not. Any that you'd choose to use should have no compatibility issues with this primer.
Answered by: MikeL
Date published: 2016-04-10
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SEM High Build Primer Surfacer Gray Aerosol
$25.99
Out Of Stock. Due back October 12