Collection: 8" Linear Blocks

Linear blocks have went to a new level! The flexible blocks are the best ! The contact of paper hitting primer is full contact of primer dust on every inch of sand paper on block. It makes sanding fun again. And the results are perfection!

Primer works just as advertised spray different colors and I use them as guide coat

Very satisfied with the starter kit. Just one comment is that I would have liked a long flexi block in the kit as well.

Great block that I added to my collection, just need an in between size. Would highly recommend these to anyone! These blocks unlike your wife will not lie to you!!

I purchased the L-411 primer after reviewing its advantages. I was sold on using one product for encapsulation, high build and some filler applied in between primer steps. I applied the primer on May 25, 2025. I'm a hobbyist and not green, but still at a learning novice level in regards to body finishes and restoration. My metal prep included paint stripping using that orange gel under plastic sheeting, scraping and cleaning old paint residue with denatured alcohol. It worked incredibly well. This gave me a good starting point for abrasives on bare metal. I used a 5" 80 grit DA with some hand block sanding. I cleaned the sanded metal with wax and grease remover, followed by a final acetone wipe down. With the humidity low, I was able to leave it overnight with no apparent flash rust. The next morning, I used the gravimetric table and interpolated what I needed for 14 ounces. I used 10% slow reducer and waited 20 minutes for the induction period. I live in the desert and needed to be done by noon when it was going to reach 95 degrees. I shot in the morning outside at 7:30am. I used a 1.7 tip HF HVLP Spectrum gun. My pressure regulated at the gun was 30 psi and a 8" fan. Unfortunately I had a small packing seal air leak in the gun that I couldn't quickly resolve, so I shot anyway. I shot the first coat at 80 degrees. After the first coat, I waited 45 minutes to ensure it flashed. It was still tacky enough to leave primer on a gloved finger. I figured it's warm and past 30 minutes - I should be okay. The second coat was applied at 85 degrees. I sprayed out of direct sunlight using a 10'x10' folding canopy. Relative humidity was about 30%. The applied primer was still tacky (glove test) after a few hours, but was completely dry by 6pm when it was still about 85 degrees. My overnight temperatures dipped down to 60F for the next two nights. I was just priming the bed interior and was able to safely cover it with a tarp, keeping the overnight temp's above 65F (being mindful of the 48 hour requirement). One tip regarding mixing. If the primer's been sitting a few months in the can, the high solids take some elbow grease to break loose. I used a wooden stirring stick to break up the thick layer of solids, followed by a $10 paint mixer on a battery powered hand drill.

It's a very good product. It sands easily and doesn't clog paper. If you consider steps saved and trying to navigate using different products, different primers, it's definitely worth it. I would buy it again and just bought another gallon. I have a few trucks to restore.

Have only used one of the blocks so far seem to make blocking much easier

I was very impressed on how well these are built. Glad to add tbese to my block inventory

Absolutely worth the cost. Be patient because this product requires 30 minutes between coats. You have to let it dry for 48 hours before sanding. If you can do that, you will not regret the results. Sprays great through a 1.8mm spray gun and sands nicely. In short, you get what you pay for. Check out their sanding blocks. Another game changer.

All the blocks I’ve bought for my project have worked so good! The acrylic with the stick it paper is way better than the mushy Velcro blocks

It sprayed really good, it sands nice and it builds good and it seems to stick very well. The price is alittle on the high side but it did save me an extra steps from my old way of doin things. It is a very very slow drying epoxy which some people may not like but it wasn’t a problem for me. But all in all I think it’s a real good product and I will be buying more in the future.

Very high quality blocks. Fast shipping . I will definitely be ordering more from them

Freaking amazing blocks and amazing customers service. Highly recommend these!

Purchased the starter set, and they are absolutely awesome, will be purchasing more products from linear.

i am a hobbyist trying to learn more about bodywork and improve my skillset in doing so. i purchased this kit and glad I did. Linear blocks were a great purchase for me and got me started in the right direction!

i am a hobbyist trying to learn more about bodywork and improve my skillset in doing so. Linear blocks were a great purchase for me and got me started in the right direction! I would recommend to anyone debating on making the purchase.