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Undercoating Gun and 2 Hoses & Bottle is rated 3.4615 out of 5 by 13.
Rated 3 out of 5 by from Good quality, bad design flaw I used the gun to spray the rubberized rust encapsulator, it was a great gun, sprayed evenly with no complaints, was easy to use and worked great. The only BIG flaw is that the pickup tube that goes into the canister comes about 3/4 of an inch from the bottom so you never spray all of the material, there is always a good amount of material left in the bottom of the canister. I ended up pouring what wouldn't spray into a cup and holding the pickup into the cup to spray the rest. I love Eastwood products and have always been impressed but I was shocked that no one would have tested this gun to the end of the material and noticed that it doesn't spray all of it. A gravity fed system would have been better...
Date published: 2012-08-07
Rated 4 out of 5 by from Did the job! I saw some of the reviews about this item that were not good. I found that the sprayer doesn't spray as well when the gun is being held at a much lower elevation than the car. it helps to hold it up, then it worked great. used it on two cars now. i think it's best value is for the internal frame coating. for undercoating, it's just as fast to buy good quality cans of rustproofing like 3m paintable kind. less cleanup- just run the cans out and then throw them away.
Date published: 2013-12-03
Rated 5 out of 5 by from Looks alittle cheap but it works great I used this gun to spray Fluid Film and it works great, the adjustable tip lets you select the amount of product you want to spray. It will spray a nice thin pattern not just spit blobs like my other undercoating guns, and the hoses work good to get into those tight places. Out of all the guns I have used this gun does the best job of spraying undercoating so far.
Date published: 2012-11-19
Rated 3 out of 5 by from Internal frame coating failure Bought this and the internal frame coating quart. Says its ready to spray but the gun dries out so fast it won't spray it even when reduced it still dries out and stops up. Wasted time and money. I don't know if the gun is any better for under coater as I haven't fed any through the gun yet.
Date published: 2013-06-09
Rated 3 out of 5 by from works ok it works ok for undercoating but not the greatest for rustproofing.the supplied wands work good on open areas and inside frame rails that have access, however they are not small enough to fit inside of body and door drain holes which would be nice to use instead of drilling holes in a perfectly good body.you can throw the plastic cup away because the feed for the gun is close to an inch from the bottom of the cup. the gun can screw right onto the top of the rustproofing and undercoating cans
Date published: 2014-03-20
Rated 4 out of 5 by from Works very well I used it for both annual antirust grease and rubberize undercoating. It works like a charm. As keith, the hoses comes in a loop and don't get straight. I found that it might be a bit short (and too curved) to reach everywhere when trying to apply antirust grease in car's doors and longer panels.
Date published: 2010-05-14
Rated 3 out of 5 by from Product is alright Easy to set up and works pretty nicely. The hoses come packaged in a loops. Since they are a stiff plastic they do not want to straighten out very well. I hung mine with a wieght on the end an used a heat gun on it. That helped but the hose still still had a pretty good curve to them.
Date published: 2010-01-26
Rated 4 out of 5 by from great gun I used this to spray my Subie with Fluid Film. It worked perfectly. Adjustable flow with the gun tip by turning in or out, it will spray very little to drowning your work piece. Same applies to both hoses. The hose with the 180' tip is actually about 30 inches and sprays a decent fog. I was worried that the hose being almost a 1/2 " diameter i wouldnt be able to get it into alot of holes without drilling but was surprised as it fit into many holes in crossmembers and brackets. I did end up drilling some holes in doors but plugged them with plastic body plugs and it looks factory. Fluid Film is the sort of the consistency of latex paint and I sprayed with my air pressure at 120 as I did'nt think to turn it down. Both hoses do come formed in a loop from being in the bag but I used a heat gun and was able to pretty much get them to straighten out. Only minor issue I had was having to switch between hoses and tip (threading on/off) but it has good smooth threading and was'nt a big deal. I recommend it
Date published: 2011-10-03
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what are part numbers for replacement of the 2- 24 " wands . need to replace damaged ones?

Asked by: woodwise
20441A is the replacement want
Answered by: SeanA
Date published: 2015-02-23

once used with coating, wich product shall i get to clean the gun ?

Asked by: horacechacon
You are able to clean the gun use lacquer thinner
Answered by: SeanA
Date published: 2014-12-22

What is the thread size of the male connector on air supply line?

Asked by: rayj2
The thread size is 1/4" NPT, a standard air tool fitting size.
Answered by: MikeL
Date published: 2014-12-11

can internal frame coating be applied with this gun

Asked by: hustolds442
Yes, it can be used to spray IFC
Answered by: SeanA
Date published: 2014-11-14

Can Eastwood Rust encapsulator be sprayed by this gun?

Asked by: fallman
Rust Encapsulator is a bit thin to effectively spray through this gun. If you are looking to apply a rust product in boxed areas, Eastwood Internal Frame Coating is a better option.
Answered by: NickC
Date published: 2014-09-29

20441A is the number for the replacement wands , I wanted to order them but when I searched for them that number doesn't come up . how do I order them?

Asked by: woodwise
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Undercoating Gun and 2 Hoses & Bottle

Item #20441 Brand: Eastwood

Rustproof like a pro...apply materials
as easily as pulling a trigger


Rustproof like a pro—Undercoating Gun makes applying undercoating materials as easy as pulling a trigger Undercoating Gun Kit comes in very handy when you need to apply our Heavy-Duty Anti-Rust, Rubberized Undercoating and Spray-on Bedliners.
  • Rustproof inside rocker panels, inner fenders and other closed box sections
  • Two 24" flexible wands each have straight and 90-degree spray tips
  • Requires 40-60 psi @ 5-6 cfm

More info...

About Undercoating Gun and 2 Hoses & Bottle

Apply Heavy-Duty Anti-Rust (not included) directly from the adjustable gun nozzle, or replace the nozzle with one of the two 24"-long, 7/16"-dia. flexible wands with straight and 90-degree spray tips. For Rubberized Undercoating (not included), spray it directly through the attached gun nozzle; extension wands are not recommended for use with undercoating. One-year mfr's. warranty. Made in Italy.


Multi-Use Undercoating Gun with 2 flexible wands and plastic bottle


16017ZP Heavy-Duty Anti-Rust (Qt.)
29836 Rigid Wand (16")
16008ZP Rubberized Undercoating
16003A Extra Plastic Bottle
16003B 1/2" Unibit® Drill Bit
16004 1/2" Plugs (25)


Click here for product instructions

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