I did two layers of glass matting between three layers of resin.
I used Elmers brand. It hardens in two hours ready for sanding and paint. I sanded it after three. It seems plenty hard and I doubt it would leak anymore.
My only fear is that there is not enough support under it and I think it will crack in the same spot if someone steps on it hard. Hopefully I can get another month and a half or so out of it. There might be something to you idea about the spray foam to give it support. Depending on the price I'm planning on replacing my steps in the spring.
I'll let you know how well it lasts.
Sean
I used Elmers brand. It hardens in two hours ready for sanding and paint. I sanded it after three. It seems plenty hard and I doubt it would leak anymore.
My only fear is that there is not enough support under it and I think it will crack in the same spot if someone steps on it hard. Hopefully I can get another month and a half or so out of it. There might be something to you idea about the spray foam to give it support. Depending on the price I'm planning on replacing my steps in the spring.
I'll let you know how well it lasts.
Sean