Bully Liner coating can improve your 3D prints dramatically

I want to 3D print parts for my project car. In this video I test out Bully Liner and bitumen liner coatings to see if they make prints stronger, hide layers lines, and UV, water and heat resistant. The results were quite encouraging, all with no sanding before or in between coats!

Models from this video:

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[HotRodHippie]

Respirator is NEVER a bad idea. The chemicals may not be “harmful” but breathing in the particulates isn’t a good idea. I work I custom car building, we wear respirators more often than not these days. Especially when spraying anything.

[phgmnt]

Quite a few months back Tom Sanderlander (?) did a test using a 50/50 mix of resin (for resin printing) and IPA and used it to coat PLA prints and hardened it with a hand UV light. I just finished testing out that concept, and resin/IPA coated 3 large cylinders for washing resin prints and I used a small UV light to cure also. And it worked, and sanding the resin mix sanded easily with a 120 grit sandpaper. A major improvement over sanding uncoated PLA. Try that for a test, a little resin goes a long way so at current resin prices it’s relatively cheap. I forgot to mention I used no brushes just a misting/spritzing bottle. The results were good with one coat and one sanding.

[OzGecko]

As someone who is about to print some external parts for a project car, this is incredibly timely. I already have a spray can of PlastDip in the workshop so that'll get first try but the brushable nature of the Bully Dip looks very promising. Thanks for the detailed comparison vid.

[radicalxedward]

Wow! Now I’m wondering about _intentionally_ printing something in PVA, covering it in liner, and then dissolving the PVA to get a hollow liner object.

[GunGryphon]

Using the stepper motor in the tub made me cringe just a bit.

[blackwolfecc]

I’ve been looking at having my truck bed done with a rhino lining. But as I prefer diy projects, the bully liner seems like the perfect product!!!

[adamtabor]

Rustoleum makes a rubberized undercoating that comes in a standard spray paint can and is as easy as spray paint to use that is designed for many similar uses as the Bully Liner and in my experience works very well. Haven't had a need to try on a print but if you want to see some results I have a few cans laying around and would happily do some tests. Not sure if it would waterproof prints or not but it does have a fair bit of textured and rubbery texture. I believe they also make an actual bed liner type spray which is more heat/UV resistant.

[Engineerdd]

I used to coat ABS parts with melted ABS in acetone. Simply pour over. Made the parts very nice looking.

[Sebazzz]

Seems interesting to use that bully liner for plastic annealing. You should send a can to Stefan from CNC Kitchen.

[saschaschneider]

That's interesting. I'll certainly do a bit of testing on my own, thanks for the nudge into this direction. I live near the sea and come April, May latest, I plan on going kayaking quite a bit and it looks like this could be useful in case I come up with ideas of things to print for that. Water: check. UV: check, heat: check, at least once summer approaches

[Audio_Simon]

Love that rugged texture. Like pro audio PA speakers! If you like that texture could try PA speaker coatings.

[Russwig]

It is pronounced : bit-too-men and the painting method of painting you used for the final coat id called "stippling". Very helpful to see this video.

[Mephmt]

Since the bully liner is made from tires, does the coating feel rubbery? I've been looking for a product to coat some plastic tires with in order to give them more traction.

[The_McFortner]

It's not surface tension that was the problem with the boats, but buoyancy. The weight added to the displacement and pushed the boats lower, increasing the pressure of the water at the openings and allowing it to flow in.

[mrclown]

A long term test with a Bully liner coated part left in a car (regularly parked in the sun) for a few months to see how it handles heat in real world use cases would definitely be interesting! Though I suspect we may see that anyway as part of the project car series.

[C-M-E]

There's a variant of Rustoleam Primer that goes on thicker straight out of a rattle can that not only hides imperfections brilliantly but you don't have to sand it if you choose not to. It's intended as a surface builder for automobiles I believe in that it can be sanded, but I've used it both ways and paint on it directly. What I really wish they had--or a more affordable version existed--is a sprayable epoxy system that's plastic safe. All the ones I know of are a two part that you can thin somewhat with airbrush thinner and apply the same way. The airdry versions work well and add a very durable outer shell, but a base level kit (last I purchased one) was around $50 US. Duracoat and Cerakote are examples of this and come in tons of colors, though the majority of Cerakotes require an oven treatment. Duracoat is mostly airdry and if you take your time with an airbrush and clean up well afterwards, goes on beautifully and won't harden in your brush.
Correction: As it's been some years since I first used Cerakote, I checked their site and surprisingly, they've moved to almost all air cure colors with only their hardcore variants requiring oven cure! Prices are much better too, with a 4 ounce kit costing $35 and going up from there.

[jonathanmelancon]

Great video. I know you don't like sanding, but I might suggest you break the edges juste a bit to allow the finish to stick. It is a very sharp edge it to stick to. It is something we have to do for any paint or varnish

[whatwhatever]

I love when you say " product".

[FrostedBattlefield]

My only wish for this video is that you had covered how well acrylic paint sticks to the product, but otherwise great video!

[_Piers_]

The stippled Bully liner models look a lot like cast iron done in sand moulds, it's a really nice effect on the fox and little guy.