Have you used "Extend" rust product. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

hanssolo · 06-30-2002, 02:36 PM

The POR equivalent NAPA has is called Extend. I believe Plasticoat has a similar product also. Extend sprays clear and turns the rust black in about 24 hrs. It dries smooth and you can paint over in 24 hrs. Is this what POR works like? I'm impressed with Extend so far, and it sure beats muriatic acid! I am curious to see how long the effects last. Illinois winter road salt is "the premier" rust test. Anyone else use it?

**Desert Rat** · 06-30-2002, 04:10 PM

I have extend in my cabinet,i prefer the brush on in easy to reach places for better coverage,and hard to get places i use the spray stuff,if in the inside of a door or something,then ill paint some black hammerite over it for a good coating

Longhorn Man · 06-30-2002, 04:12 PM

What does this stuff cost?
While I have not used alot of NAPA's products, so far, I have been rather impressed.

GMCjunkie · 06-30-2002, 04:13 PM

I used ALOT of it about 2 years ago, and so far the rust has not come back, I was very happy with the results.

**Desert Rat** · 06-30-2002, 04:20 PM

any autoparts store,even WalMart here spray can i believe was around $5 brush on jar i think about the same.Awesome for inside of cab corners,kick panels etc.i used on the inside of all those places on my truck,and painted floor with a roller and Hammerite,came out smooth(and carpet hides),then i dismanteled interior and prepped and painted the correct way with a spray gun.

hanssolo · 06-30-2002, 04:26 PM

spray cans cost about 2.50 per can. I did all 4 control arms and the spindles with those, and then some spots up front. Whats Hammerite?

johnnyp · 07-01-2002, 09:53 AM

hanssolo, POR-15 does not work like Extend. POR-15 is a coating that is applied over a rusted surface to encapsulate the rust but not chemically change it. Extend chemically changes the rust, similar to Navel Jelly, which means it must be coated to prevent future rust. Also, Extend is not a NAPA product. It is made by Loctite and sold under the Permatex and Duro brand name (both owned by Loctite.

Check out this site for a comparison of products that chemically change rust:

http://www.geocities.com/goodytommy/rust/

murfslaw · 07-01-2002, 01:23 PM

What's the difference between Extend and Osphos?

Paul Clark · 07-01-2002, 03:25 PM

Since Extend is made by Loctite and sold under both the Duro and Permatex brand names, does this mean that Extend is not always called "Extend"? Any other names for the same stuff?
Also, since it has to be top-coated, could I use it under the cab and then spray on some undercoating?
Thanks

hanssolo · 07-01-2002, 06:49 PM

I don't think it HAS to be painted over, but most will do it anyway. It can only protect more. I believe undercoating over it would last a very long time. JMO.

photoglg · 07-01-2002, 09:18 PM

I just did the cab floor with extend I brushed it on let it dry and added a second coat.

Stano · 07-02-2002, 09:00 PM

I have used Extend a lot. I call it my garage in a bottle. LOL Actually I used it to cover my bare metal and welds when I did my cab corners and rockers and when I welded trim holes up in my bed cause I like to work out side in the summer. Can't beat the lighting. Anyhow that was two years ago on the corners and rockers. Meanwhile the cab has been painted and such but it sat out side for several months with nothing but 2 coats of Extend on the bare metal and no rust. I have used the spray on version and will not buy it again though because everytime I have used it it began to peel off and flake. So my vote is for the brush and wipe on Extend.

nroden · 07-03-2002, 12:01 AM

About the undercoating. I have heard some people say it absorbs some moisture and makes it stick and that they have had rockers rust faster with it than without.
I did put it on my rocker and cab corners before I heard that though.. no problems yet but it hasnt been outside yet.

Paul Clark · 07-03-2002, 12:56 AM

You guys that really know your stuff correct me if I'm wrong - but I think undercoating works fine and doesn't absorb moisture - unless it starts flaking off in a few spots. Then there's a "pocket" that can hold moisture (road salt) and cause rust. Correct?

06-30-2002, 02:36 PM	#1
hanssolo Registered User Join Date: Sep 2001 Location: central Ill. USA Posts: 447	Have you used "Extend" rust product. The POR equivalent NAPA has is called Extend. I believe Plasticoat has a similar product also. Extend sprays clear and turns the rust black in about 24 hrs. It dries smooth and you can paint over in 24 hrs. Is this what POR works like? I'm impressed with Extend so far, and it sure beats muriatic acid! I am curious to see how long the effects last. Illinois winter road salt is "the premier" rust test. Anyone else use it? __________________ 69 C10 longbed: 357c.i. /TH400/3.73s/AC/ beige primer/saving $ for paint ______________________________

06-30-2002, 04:13 PM	#4
GMCjunkie Dude...I'm a CHICK Join Date: Jul 2000 Location: Lakeland Georgia Posts: 6,192	I used ALOT of it about 2 years ago, and so far the rust has not come back, I was very happy with the results. __________________ ~~~~~~~~~~~~~* "The unexamined life is not worth living" -Socrates ~~~~~~~~~~~~~* '71 GMC Suburban 4x4

06-30-2002, 04:26 PM	#6
hanssolo Registered User Join Date: Sep 2001 Location: central Ill. USA Posts: 447	spray cans cost about 2.50 per can. I did all 4 control arms and the spindles with those, and then some spots up front. Whats Hammerite? __________________ 69 C10 longbed: 357c.i. /TH400/3.73s/AC/ beige primer/saving $ for paint ______________________________

07-01-2002, 09:53 AM	#7
johnnyp Keepin' It Stock Join Date: Aug 2001 Location: Grand Island, Nebraska, USA Posts: 554	hanssolo, POR-15 does not work like Extend. POR-15 is a coating that is applied over a rusted surface to encapsulate the rust but not chemically change it. Extend chemically changes the rust, similar to Navel Jelly, which means it must be coated to prevent future rust. Also, Extend is not a NAPA product. It is made by Loctite and sold under the Permatex and Duro brand name (both owned by Loctite. Check out this site for a comparison of products that chemically change rust: http://www.geocities.com/goodytommy/rust/ __________________ 72 Sierra Grande - Maych Forget about "do it right the first time". Do it wrong the first time to learn how, then do it right the second time.

07-01-2002, 01:23 PM	#8
murfslaw Registered User Join Date: Apr 2000 Location: Tarzana, CA Posts: 78	What's the difference between Extend and Osphos? __________________ 69 C10 lwb, 400 sb, Turbo 400,

06-30-2002, 04:10 PM	#2
Desert Rat Senior Member Join Date: Dec 1999 Location: Darrington, Washington Posts: 3,963	I have extend in my cabinet,i prefer the brush on in easy to reach places for better coverage,and hard to get places i use the spray stuff,if in the inside of a door or something,then ill paint some black hammerite over it for a good coating

06-30-2002, 04:12 PM	#3
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	What does this stuff cost? While I have not used alot of NAPA's products, so far, I have been rather impressed.

06-30-2002, 04:20 PM	#5
Desert Rat Senior Member Join Date: Dec 1999 Location: Darrington, Washington Posts: 3,963	any autoparts store,even WalMart here spray can i believe was around $5 brush on jar i think about the same.Awesome for inside of cab corners,kick panels etc.i used on the inside of all those places on my truck,and painted floor with a roller and Hammerite,came out smooth(and carpet hides),then i dismanteled interior and prepped and painted the correct way with a spray gun.

07-01-2002, 03:25 PM	#9
Paul Clark Registered User Join Date: Apr 2002 Location: Center Point, IA Posts: 502	Since Extend is made by Loctite and sold under both the Duro and Permatex brand names, does this mean that Extend is not always called "Extend"? Any other names for the same stuff? Also, since it has to be top-coated, could I use it under the cab and then spray on some undercoating? Thanks

07-01-2002, 06:49 PM	#10
hanssolo Registered User Join Date: Sep 2001 Location: central Ill. USA Posts: 447	I don't think it HAS to be painted over, but most will do it anyway. It can only protect more. I believe undercoating over it would last a very long time. JMO. __________________ 69 C10 longbed: 357c.i. /TH400/3.73s/AC/ beige primer/saving $ for paint ______________________________

07-01-2002, 09:18 PM	#11
photoglg Registered User Join Date: Jul 2001 Location: Oxnard, CA Posts: 143	I just did the cab floor with extend I brushed it on let it dry and added a second coat. __________________ 1969 GMC S/B S/S 3" drop

07-02-2002, 09:00 PM	#12
Stano Registered User Join Date: Jul 2000 Location: Mo Posts: 963	I have used Extend a lot. I call it my garage in a bottle. LOL Actually I used it to cover my bare metal and welds when I did my cab corners and rockers and when I welded trim holes up in my bed cause I like to work out side in the summer. Can't beat the lighting. Anyhow that was two years ago on the corners and rockers. Meanwhile the cab has been painted and such but it sat out side for several months with nothing but 2 coats of Extend on the bare metal and no rust. I have used the spray on version and will not buy it again though because everytime I have used it it began to peel off and flake. So my vote is for the brush and wipe on Extend. __________________ New daily driver 96 Chevy K3500 crew cab dually 53,000 miles 350 Vortec 4L80 Nice ride 67 Chevy C-10 LWB Built 350 TH-400 Wifes ride and family rig: 2001 Furd Expedition 5.4 Liter Kickin back in Rolla,Mo. USA "Do the thing you fear most and the death of fear is certain" Mark Twain

07-03-2002, 12:01 AM	#13
nroden Registered User Join Date: Jun 2001 Location: Springfield, MO Posts: 1,098	About the undercoating. I have heard some people say it absorbs some moisture and makes it stick and that they have had rockers rust faster with it than without. I did put it on my rocker and cab corners before I heard that though.. no problems yet but it hasnt been outside yet. __________________ Nick Rodenberg 72 Cheyenne 10 V8 350/TH350 white/ochre/white/ochre, ochre/saddle interior Retired and in the dry... still runs. I now drive Red '01 Ford Focus... better MPG!!!

07-03-2002, 12:56 AM	#14
Paul Clark Registered User Join Date: Apr 2002 Location: Center Point, IA Posts: 502	You guys that really know your stuff correct me if I'm wrong - but I think undercoating works fine and doesn't absorb moisture - unless it starts flaking off in a few spots. Then there's a "pocket" that can hold moisture (road salt) and cause rust. Correct?



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