SEM 42013 Grey High Build Acrylic Primer - 16 oz.

used this to paint some chrome trim around the front grille of a 06 Acura TSX. It had lots of rock chips and dings so i wanted a high build primer to fill it in. i didn't do much sanding before since it was going to get chipped up again after a month of driving but the SEM primer filled in nearly everything smooth. the best part is they use a great spray nozzle. did 3 coats and every time i used it it was a nice predictable even spray pattern with no splatter. came out perfect, easy to sand, and easy to add a few extra coats in spots that need more build up. i had no intention to make the trim piece perfect before paint but it ended up perfect thanks to this primer.

The good stuff!

I was looking for a new primer recently and came across a post a friend made on finishing a helmet project for some prop work. He said he tried out a new primer and loved it. So I asked what it was and ordered a can and "OH MAN!" Fantastic primer. Yeah it is a tad bit on the expensive side but I use it to finish models and 3d prints as it helps fill seams really well and saves me a lot of time sanding and finishing. So that makes it worth it to me. Fantastic hold and the grey color is perfect for building on top of. This will be my base primer coat on everything going forward.

I couldn't believe I had been using inferior primers in the past until I tried SEM. This primer sprays on smooth and the high build formula fills in tiny pores and pinholes with 1-2 sprays. I used the High Build Primer on some custom speaker pods I'm fabricating, and the drying time is fairly quick. I also liked how the primer stayed together even after sanding with 60-grit, other primers would start to chip off but not the SEM primer. I wanted to give this 5 stars but even though the end results are better than store-bought primer, you still have to pay about 4-times as much for the SEM stuff. If the price was a tad lower it would have gotten the full 5 stars from me.

A little more expensive than other cheap primers but is overall worth it. Easy to use due to a good spray pattern and it laying out nicely. Drys quickly.

I'm painting my boyfriend's truck ('94 F150). The primer went on great, no spits from the nozzle. I painted 2 coats and the last coat I used black so I can see where I sand (and so his truck doesn't look horrible while I wait for the color paint and clear coat). Prepped by sanding with 150 (lots of paint down to the metal, and some rust), then went up from there, washed with white vinegar/dawn/hot water mix, then wiped down with alcohol.

I refinish a fair amount of automotive parts but I finish even more 3d printed parts and this has been my go to primer for a while. The regular store bought cans end up gumming up my sandpaper super fast and just do lay down as nice as this. It dries fast and sands awesome, just wish it was a little bit more affordable.

Complete garbage. The description should read “high build and un-sand-able primer”. Completely ruined my casting mold. Had to grind it off with 80 grit and start over. All I needed was a light coat to fill in the and then smooth out the 120 grit sand scratches. Tried to sand and smooth out with 320, that didn’t touch it. Then 220, that didn’t touch it, then 120 just to get rid of it. Nope. Garbage!!