What's the difference between this product and sem self-etching primer?

The high build primer is used under the top coat, to fill any scratches or minor imperfections while finish sanding, and self-etching is used only on bare metal, under any body filler, or other primer.

Does this stick to silicone?

NOTHING sticks to silicone...or...nylon.

How well will this adhere to existing finishes? I have some bare metal and some areas of existing paint and other primer.

As long as you sand the paint and medal with at least 220 grit sand paper fine. I have been using it on fiberglass/paint. It will show you the high spots and lows. You could also use a contrast material to make sanding easier to get your smooth finished product. Hope this helps.

How long does it have to dry before recoating?

It is mainly depending on environmental temperture. Watch the first coat, when it flashes, it is ready for the next coat. A little extra wait wont hurt.

Sem 42013 Grey High Build Acrylic Primer 16 Oz

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Sold byAmazon South KoreaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚗 Prime Like a Pro — Prep, Fill, and Finish with Confidence!

TRUSTED BY PROS - Ranked #34 in Automotive Primers with 4.5-star reviews, join the community of expert users who demand quality.
HIGH BUILD POWER - Generous 16 oz volume delivers excellent filling properties for smooth, professional-grade priming.
EFFORTLESS SANDING - Matte finish designed for easy sanding, speeding up your prep time and perfecting your topcoat base.
UNMATCHED SURFACE PREP - Elastomeric acrylic formula ensures flawless adhesion on automotive metals, aluminum, urethane, and plastics.
VERSATILE COMPATIBILITY - Works seamlessly with most refinish materials, making it the go-to primer for any automotive project.

The SEM 42013 Grey High Build Acrylic Primer is a 16 oz elastomeric acrylic surfacer designed for superior adhesion and filling on automotive metals, aluminum, urethane, and plastics. Its matte finish allows for easy sanding and compatibility with most refinish topcoats, making it a versatile and trusted choice for professional-grade automotive surface preparation.

Specifications

ASIN	B000PKX16A
Age Range Description	Adult
Best Sellers Rank	#47,283 in Automotive ( See Top 100 in Automotive ) #34 in Automotive Primers
Brand	SEM
Brand Name	SEM
Color	Grey
Color Code	#808080
Container Type	Bottle
Coverage	Full
Customer Reviews	4.5 out of 5 stars 336 Reviews
Finish Type	Matte
Global Trade Identification Number	00646786420139
Indoor Outdoor Usage	Indoor
Is Waterproof	False
Item Form	Liquid
Item Volume	16 Fluid Ounces
Item Weight	1 Pounds
Manufacturer	SEM
Model Name	42013
Model Number	42013
Paint Type	Acrylic
Part Number	42013
Size	16 Ounce (Pack of 1)
Special Feature	Provides superior adhesionExcellent filling propertiesWorks on multiple substrates, including metal and plasticEasy to sandTopcoat with most refinish material Specifications Special Feature Provides superior adhesionExcellent filling propertiesWorks on multiple substrates, including metal and plasticEasy to sandTopcoat with most refinish material Specifications See more
Special Features	Provides superior adhesionExcellent filling propertiesWorks on multiple substrates, including metal and plasticEasy to sandTopcoat with most refinish material Specifications
Specific Uses For Product	Automotive
Surface Recommendation	Aluminum,Metal,Plastic
UPC	646786420139
Unit Count	16.0 Ounce
Water Resistance Level	Water Resistant

Reviews

A**R

25.05.2022

A**R

29.09.2025

P**W

11.04.2026

J**R

10.03.2026

J**.

23.05.2018

K**E

22.01.2024

J**Y

18.01.2017

R**Y

9.08.2025

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