Ouch. I sincerely hope this isn't so, but I have seen it mentioned before.
My first build is structural ply with A-bond glue and has been heavily soaked in the Mix.
The plywood came from a mix of suppliers.
Some is Arauco Plywood from South America that I got from the Mitre 10 store in Port Augusta.
It was stamped "A-Bond" and they say on their website that all Arauco plywood is manufactured from plantation grown Radiata Pine glued with "WBP A-bond Exterior Phenol-Formaldehyde resin."
That is the side walls, floor, kitchen bench and interior cupboard floor. It all got soaked in the Mix.
The roof is Ecoply structural ply from Bunnings at Parafield. This is stamped as having an A-Bond.
I discussed structural ply with a representative of Carter Holt Harvey who supply Bunnings with the Ecoply.
He said the glue is the same as marine ply. In any case, that got soaked in mix too.
I put Zinsser Cover Stain primer over this (oil based) and then Solver Exterior Oil-based enamel.
I have noticed no delamination after 10 months of quite regular overnight trips. Winter being a great time to camp here, its been wet a few times from rainfall, too.
I note that the face veneers of several raw off-cuts that have been out in the weather for about 18 months have degraded badly. Checked, split, peeling. That there mix is very important, I think. It seems to me that the one of the very significant things in Australia is that unless you try much harder than the Big Green Shed, you are going to get plywood made with Radiata Pine. When you look at electron microscope pictures of the end grain, the pores are huge and more numerous than the pores in hardwoods. I reckon the sponge like nature of the wood makes the Mix imperative.
My second build is using 12mm ply for the floor and side walls that is stamped as BS1088 marine plywood.
I gave up on trying to bend the rather poor quality 6mm I bought for the roof. Some of that wasn't WBP when I boiled it I found, and it was just plain too stiff to bend with its very uneven veneer thicknesses.
So off the 'guta again. The "7mm structural" plywood I bought up there had "A-bond" written on the price tag on the racks, and "Arauco" and "6.5 BC WBP" stamped on it.
When I get to cutting the roof, I will be able to boil some samples.
I'll go with 12mm marine ply, the WPB stamped 6.5mm Arauco ply, and some of the materials I used for the first camper.
I'll do a piece of each "raw" and sealed with the Mix.
Or maybe I might get netter peace of mind not knowing.
![Confused :?](./images/smilies/econ_confused.gif)