Epoxy on plywood

I have just started to build a Tatman boat kit. I am starting by covering yhe plywood parts with epoxy. I sanded the surfaces with 220 grit sand paper and then vacuumed the dust off and also rubbed the surface with a wet rag to clean any excess dust then let it dry. I then spread a section with epoxy and started to roll the epoxy with a foam roller. As I was rolling I noticed fiber from the plywood was being pulled off by the epoxy when rolling. It is quite noticeable and I'm not sure why this is happening or what I can do about it. (This kit is most likely over 10 years old) Any help on this would be greatly appreciated.

Thanks,

Randy Young

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Permalink Reply by tungsten on November 26, 2013 at 6:09pm

My guess its the foam roller hooking the slivers of ply,when you wiped it with a wet cloth this raised the grain and the roller is catching it.

Permalink Reply by Randy Young on November 26, 2013 at 7:01pm
Thanks, I won't use a wet rag on the rest of it. Do you think it will sand out of the epoxy that I've done do far?

Randy
Permalink Reply by tungsten on November 26, 2013 at 7:25pm

Stand back 4 feet it will go away:).If its that bad then the only way is to sand it as its under the goo,watch out you may just do more harm then good.If your planning on glassing over it don't worry about it.

Permalink Reply by Randy Young on November 26, 2013 at 8:26pm
Thanks for the info. I appreciate it very much.

Randy
Permalink Reply by Richard Elder on November 27, 2013 at 11:38am

Water and epoxy get along worse than cats and dogs!  If you didn't get white blushing yours probably was sufficiently dried and will be OK structurally.

I like to flow coat my panels that are to remain bright finish and not get fiberglass cloth.  This is done by laying the panel dead flat, pouring the epoxy out onto the surface and spreading it out evenly with a finely notched plastic spreader, then judiciously and slowly rolling it with a thin foam roller.  Roll it too fast and you will get bubbles.  Do it  right and you will get a  mirror finish after it flows out level. 

Permalink Reply by Sandy Pittendrigh on December 24, 2013 at 1:45pm

Epoxy resin on plywood isn't worth much without glass fabric to go with.  I costs a lot. Adds weight and accomplishes little. It will still crack eventually. Water will soak into the wood in the immediate area of the crack, which will turn the wood black and make the crack bigger.  It's best to use just oil.  Or to use resin and glass fabric together. Epoxy resin without fabric does more harm than good.

Permalink Reply by Randy Young on December 24, 2013 at 6:14pm
I've already put 4 coats of varnish over the epoxy. (so there's no going back now) I guess time will tell how it all works out. Thanks
Permalink Reply by Phillip Westendorf on December 25, 2013 at 5:04pm

Randy,

In the future when cleaning a large surface (plywood) to be epoxy coated or a joint surface when joining two or more pieces.  Use alcohol (rubbing) and a white paper towel to remove the remaining wood dust. West System has an article in a previous edition of their EpoxyWorks Magazine showing the results of a study they did.  The result is a stronger joint.

Hope this helps,

Dorf

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