MG-Cars.info

Welcome to our Site for MG, Triumph and Austin-Healey Car Information.

Recommendations

Parts

MG parts spares and accessories are available for MG T Series (TA, MG TB, MG TC, MG TD, MG TF), Magnette, MGA, Twin cam, MGB, MGBGT, MGC, MGC GT, MG Midget, Sprite and other MG models from British car spares company LBCarCo.

MG TD TF 1500 - Does Copper Naphthenate corrode metal?

I'm going to treat old and new wood on my TF with solvent based Copper-Green Wood Preservative that contains 10% Copper Naphthenate. No warnings are given about possible corrosion on metal in contact with wood treated with the product.
http://greenproductsco.net/wood-preservatives

However, the Safety Data Sheet of a similar water based product, Woodlife Coppercoat Green, with Copper Naphthenate and Monoethanolamine warns:
CONDITIONS TO AVOID: Avoid contact with metals.
INCOMPATIBILITY: Product slowly corrodes copper, aluminum, zinc, and galvanized surfaces. Incompatible with strong oxidizing agents, strong acids and strong alkalies.
http://www.rustoleum.com/product-catalog/consumer-brands/wolman/woodlife-coppercoat
Safety Data Sheet:
http://www.rustoleum.com/MSDS/ENGLISH/1901A.pdf

> Does Copper Naphthenate corrode metal?
> Do you suggest any better preservatives?
> Do I even need to apply a preservative?

Thanks for your help,

Lonnie
TF7211
LM Cook

From the data available, there is a small risk of corrosion or erosion if the adjacent metal surface has been primed.

It appears that the advice is precautionary, to prevent come back if it is used in unpredictable situations and then there is some damage done.

http://nisuscorp.com/images/uploads/CuNap_Corrosivity_Data.pdf

In fact a good hardwood does not need preservative if it does not get and stay wet for prolonged periods.

Hope this helps.
Ian Bowers

I'm not sure that treating Ash with copper naphthenate by brushing or even dipping will do a lot of good as its a hardwood, its not very rot resistant though. I think its better just to paint it to provide a moisture resisting coating, which is what I did.
Dave H
Dave Hill

I am not sure the ash would really need any treatment, the only wood on my TF that needed replacement after all those decades since it was new were the two pieces at the rear of the tub. That said, on those replacement pieces I did use a few coats of boiled linseed oil -wiping off the excess after each coat once it sinks in.
JB
J K Barter

Among other pieces, I also replaced the two pieces on the rear of the tub, which I coated with two coats of thin Marine varnish after curing I sprayed them with primer and they got painted at the paint shop. Will they last another 60 years, not my worry! PJ
PJ Jennings

Hi Lonnie,

I can't answer your question but the best I can do is offer what I used to treat the wood to my TF. I was happy with the results. Be sure to apply in a well ventilated area.

I used Rot Doctor CPES
https://www.rotdoctor.com/products/cpes.html.

If you read the QnA section, there are questions if this product is safe for metal contact. It is.

Trolley restoration with ash.

https://www.rotdoctor.com/L/MiscL/mQA028.html.


Bentley ash frame treatment / restoration.

https://www.rotdoctor.com/L/MiscL/mQA016.html


Frank
TF1414

Frank Cronin

Another option for wood treatment is to use a waterproofing membrane such as is used in bathrooms prior to tiling. I used a water based membrane on both sides of the floor and the sub dash when I made them, prior to painting them satin black. Obviously no incompatibility issues. Cheers
Peter TD 5801
P Hehir

Thanks Frank,

I saw your post on the BBS about RotDoctor when I was searching the archives for info about preservatives.

Wood preservative is probably a moot point. I'm on my fourth day of trying to fit a new hinge pillar. At this rate, I'll never drive the car in the rain or shine!

Lonnie
TF7211
LM Cook

This thread was discussed between 31/07/2018 and 02/08/2018

MG TD TF 1500 index

This thread is from the archives. Join the live MG TD TF 1500 BBS now