by Postal_Dave » Mon Mar 15, 2021 10:58 am
I've documented bunches of experiments on PMF on the forum. As they said, you have to do some experimenting for yourself to get this right. Also, it familiarizes you with the process before you start work on the actual camper.
This is what I've found to work the best.
I sand the foam to make rows and get the hot wire melt off. Then wipe it down so any loose material is gone. Then make the pot marks in it. (I don't want the sanded material inside the pot marks.)
Then I pour full strength TBII on the surface and smooth it out, making sure I fill all the pot marks and rows with glue. This creates anchor holds for the glue and canvas. Then let that dry for 24 + hours.
(Quick experiment here. Pour a big drop of TBII on a piece of wax paper and let it dry for 24+ hours. Pour the same size big drop next to and over lapping the first drop. So it looks like a Venn Diagram. Let that dry for 24+ hours. Now peel the glue drops off the wax paper and try to pull the two drops apart. It will not break at the seam.)
Then I pour a lot of full strength TBII on the canvas and work it in on one side of the canvas, then flip the canvas over and place the glue covered side of the canvas on the foam. Then scrape and press the top of the canvas to get out the wrinkles and make sure the glue is in good contact with the foam. Wait another 24+ hours for that to dry.
(If you try this method yourself on a scrap piece of foam and canvas, you can pull the canvas off and see how much foam it brings with it.)
The rest of the instructions here are just for finishing it off.
I start to layer diluted TBII to soak the weave of the canvas. It can take days for diluted TBII to dry. After all that, I prime and paint the canvas and it is well protected from the weather.
BTW: Don't use diluted TBII to adhere your canvas to the foam. I've done many experiments with it and it is much weaker than full strength TBII for adhesion.
Always try several different methods and experiments before working on your camper. It will save you a lot of time and money in the end.
Good Luck
Last edited by
Postal_Dave on Tue Mar 16, 2021 12:03 pm, edited 1 time in total.
Never argue with an idiot. They will bring you down to their level and beat you with experience.