Patching/repairing poor man’s fibreglass

Hello Everyone
I purchased a DIY Foamie camper that is built with a small timber frame and foam in between on the outside and ply in the inside . The foam has been covered with canvas and pmf.
I didn’t do any of this ,this just what the guy I bought it off told me .
There is a few sections it looks like he has messed up the canvas and just siliconed over and there is one section that the silicon has come off now and I can see bare wood and foam .
I’m currently travelling with this camper and going to be on the road for 5 months with it so I’m just looking to do what is necessary to make it water tight and make it look a little nicer when I sell it . Don’t have the time or facilities to do anything major .
Does anyone have experience with patching pmf ?
The part in my trailer that is the worse and most urgent to fix is indented in so I will need to build it up to be level with the rest of the surface .
I was thinking of maybe using some sort of fibreglass filler but not sure if that will work ?
Thanks!!
I purchased a DIY Foamie camper that is built with a small timber frame and foam in between on the outside and ply in the inside . The foam has been covered with canvas and pmf.
I didn’t do any of this ,this just what the guy I bought it off told me .
There is a few sections it looks like he has messed up the canvas and just siliconed over and there is one section that the silicon has come off now and I can see bare wood and foam .
I’m currently travelling with this camper and going to be on the road for 5 months with it so I’m just looking to do what is necessary to make it water tight and make it look a little nicer when I sell it . Don’t have the time or facilities to do anything major .
Does anyone have experience with patching pmf ?
The part in my trailer that is the worse and most urgent to fix is indented in so I will need to build it up to be level with the rest of the surface .
I was thinking of maybe using some sort of fibreglass filler but not sure if that will work ?
Thanks!!