MGB & GT Forum

Has anyone tried herculiner as a undercoat ?

I used SEM Pro-Tex truck bed liner. It was tinted to match the body color.

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Lee Miller

Experience - hobbyist, rotisserie restoration 1967 MGB, welding, bodywork, painting, wiring, interior, suspension, clutch, engine, SU HS4 carburetors, windshield, and installing convertible top.

Website www.myclassicmg.com

1971 MG MGB
1971 MG Midget
1967 MG MGB
1966 MG MGB restoration project

Lee Wrote:
How did it work? any shortcommings? Drip? etc.

I worked good. Sandblasted to bare metal, epoxy primer, then SEM pro-tex. I used a schutz gun but brushing and rolling may be easier.

http://www.miller-garage.com/tech_bedliner.php

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Lee Miller

Experience - hobbyist, rotisserie restoration 1967 MGB, welding, bodywork, painting, wiring, interior, suspension, clutch, engine, SU HS4 carburetors, windshield, and installing convertible top.

Website www.myclassicmg.com

1971 MG MGB
1971 MG Midget
1967 MG MGB
1966 MG MGB restoration project

thanks, what did you use to tint?

The paint store matched the color.

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Lee Miller

Experience - hobbyist, rotisserie restoration 1967 MGB, welding, bodywork, painting, wiring, interior, suspension, clutch, engine, SU HS4 carburetors, windshield, and installing convertible top.

Website www.myclassicmg.com

1971 MG MGB
1971 MG Midget
1967 MG MGB
1966 MG MGB restoration project

I did something similar. Here's a write up in my journal. It's been great, was pretty simple to do and I would highly recommend it.

http://www.mgexperience.net/journal/jmoore/359

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John Moore

'70 MGB, '68 MGBGT, '99 Land Rover Discovery II, '61 Austin Healey Bugeye Sprite

I used herculiner on my tractor cab's floor and then put some cheap car carpeting over that. I know it is not an MG, but I did it to seal the metal to stop any more rust, and it was pretty bad rust. Make sure you use the right paint thinner and prep the surface really well. You don't need a primer for it, you just need a really good clean, scuffed surface. The stuff on my tractor has been great. I used some permatex rust primer stuff (basically spray on naval jelly). 1 Qt would probably do about 3 of my tractor cab floors, so I would think that 1 quart would be almost enough for the underside. I applied it using a paint brush too, not the cleanest nor prettiest application at first, but once dry it looked pretty good. I am thinking about using this on the whole interior floor of my MG, but I am not sure how I would glue the carpet to it. On the underside I will probably use either this or the loctite stuff that VB sells on the bottom of the new floor panel. I hate rust and dont want to deal with it! If I ever do the engine bay...you can bet Herculiner will be looked into especially around the master cylinders and brake parts as those places need repainting soon. I have hosed them off and fixed the leaks, just gotta get the metal prepped and covered.

Hurst

Looks good, but how much might it weigh?

Damn, I sprayed the entire underside of mine with regular rubberized black undercoating just two months ago. I sprayed the hell out of it. How feasible is it to clean the underside to bare metal on a B that is in running condition so bedliner could be applied. I don't have a rotisserie, and would need to do it in the garage. My engine compartment and floor pans have been coated with duplicolor bedliner (spray on). That was done 7-8 years ago. Best thing I ever did. The duplicolor drys fairly smooth and is resistant to brake fluid (not that that matters anymore since I have converted to silicone fluid). Maybe at this stage it would be too much to try to clean up the underside so bedliner could be applied. How would you remove all that undercoating and whatever type crap is under there? Would the fresh application of standard undercoating be enough to protect the B in Winter driving on salted roads? I'm getting road fever since I bedded the B down for the Winter. I want to drive it in the snow but the salt scares me.

Soyokaze 72MGB Wrote:
That was my next question. I took the time to scrape off the original undercoat off my RD for that reason! A gallon of paint does have some significant weight. I would assume that undercoating paint would be more.

Not a problem for the average car. the benefit will outweigh the additional weight, if applied properly.

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It took a gallon to do the entire chassis and under the wings with some left over.

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Lee Miller

Experience - hobbyist, rotisserie restoration 1967 MGB, welding, bodywork, painting, wiring, interior, suspension, clutch, engine, SU HS4 carburetors, windshield, and installing convertible top.

Website www.myclassicmg.com

1971 MG MGB
1971 MG Midget
1967 MG MGB
1966 MG MGB restoration project

I think the bedliner material is actually more of a lightweight plastic, versus the heavy rubberized undercoating. besides, what's it going to hurt to add a bit of weight to lower your center of gravity. We're talking maybe 30 lbs for the whole undercarriage! Probably closer to 15 lbs. though.

If you have it done, masking off the insides of the spring perches, bolts, drain holes, etc is very important. Otherwise it can be a LOT more work assembling everything! If my car wasn't on a rotisserie, I don't think the local Line-X would have touched it. Instead, it cost me about the same as having a truck bed sprayed, and that included ALL the masking!

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jeff@advanceddistributors.com

I see you guys are talking about the underside but I was thinking of doing the trunk area with a color match bedliner spray. What do you think?? The car is slated to get painted this off season.

I used a truck bed coating to replace the undercoating in my wheel wells. The OE undercoating finally started to crack and peel after 30 yrs, and having seen these bedliner materials take some pretty severe abuse, I figured that it couldn't be any less effective or long lived than the OE undercoating. It works very well, and I think that doing an entire undercarriage and trunk floor would not be a bad idea for long term protection. It might not be a bad idea for the forward floor area of our cars inside as well, as it would resist moisture better than most things.