Paint-like product used to coat interior seams?

[mistahlee33]

Hi,

I am doing a lot of work on a 31 ft 1971 airstream and I am just wondering what the product is that I have seen used over the interior seams...not the trempro, but there is a paint like product applied with a brush overtop of the seams, it appears white and looks to be like a thick paint. It is in a video from airstream and I have seen it used on other videos but cannot find out what its called. Any help would be appreciated.

Thanks

[Mixter]

Wondering same thing

[Aerowood]

I have thinned down sealant in order to paint it on. What ever solvent that is used to clean the sealant up can be used to to thin it for a paintable sealant