Foretravel Owners' Forum For owners and Fans of Foretravel Motorcoaches September 05, 2025 ...

1 1/2" flat steel cut into 2" or 3" pieces with a hole drilled in the middle would be easy to make and spread the load nicely.

Peter,

Up until the last generation of Vogue motorhome that was built up in Prior, OK they used spray foam and didn't have it covered with filon. One of the engineers told me it was the best for sound, R value, and not trapping water. The down side was damage from road junk being kicked up from the tires.

What is the best paint to use on the frame to stop rust.
I've been thinking of urethane foam to cover the bottom where insulation needs to be and looking
for pros and cons.

I'm going to
weld all the joints all around and grind all the top and bottom welds smooth. Foretravel only did the vertical
welds.

I think not welding the joints all around allows water in, which speeds up the deuteriation as it rusts
from inside and outside.

What is the best paint to use on the frame to stop rust.
I've been thinking of urethane foam to cover the bottom where insulation needs to be and looking
for pros and cons.

POR-15 is one possibility. There are a number of anti-corrosion coatings available today that will work. Zinc Chromate is a powerful anti-corrosive but difficult to work with due to high toxicity.

Any body have any idea the amount of paint I would need to paint the frame?

What is the best paint to use on the frame to stop rust.
I've been thinking of urethane foam to cover the bottom where insulation needs to be and looking
for pros and cons.

I tried some 6 Lb. Density Expanding Pour Foam, 2 Part Polyurethane Closed Cell Liquid... on mine and it worked great. I only used it in one square. I was having trouble keeping things warm enough in the winter to get good expansion. but that section is great. It does create a bit of heat, so just be aware if you put the bottom sheet on before you pour the foam. The rest of the area I did the XPS foam boards like they had originally. I ended up putting sheet metal on the bottom instead of the original sheeting and riveting it into the frame. I figure it would add some protection to the underside.

If I had to do it again, I would rivet the sheet on, then pour the foam over everything and maybe use the 2lb foam since the 6lb is pretty dense. It cut easy with a reciprocating saw and sanded great with a belt sander to get a smooth finish.

6 lbs foam is crazy heavy. I used to cut truckloads of 1 lbs foam and always thought 2lbs foam was so heavy.