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Postal_Dave wrote:Instead of using one, all purpose primer to make Poor Man's Fiberglass, it may be best to use a layering system.
The Bondz could be the adhesion for the canvas to the foam. Possibly diluted TBII to fill the weave of the canvas to prevent rot. (Diluted TBII has been used successfully before for that.) Then another primer or paint with a high UV and weather resistance property as a top coat.
John61CT wrote:Postal_Dave wrote:Instead of using one, all purpose primer to make Poor Man's Fiberglass, it may be best to use a layering system.
The Bondz could be the adhesion for the canvas to the foam. Possibly diluted TBII to fill the weave of the canvas to prevent rot. (Diluted TBII has been used successfully before for that.) Then another primer or paint with a high UV and weather resistance property as a top coat.
Cost issues, complexity, possible compatibility problems that only show up years later.
To me the foundational ethos of PMF is
low-tech simplicity, small number of low cost commonly available materials.
I am only concerned about weave-filling from the structural / waterproofing POV.
If a smooth finish is desired for **cosmetic** reasons, that along with the outermost paint is to me a separate issue, lots of filler approaches including acrylic gesso with GG.
But for me the only issue here is structural and waterproofing, and
I want **one** adhesive-sealant that waterproofs, encapsulates and bonds the canvas to the foam.
John61CT wrote:Gripper is supposed to do the heavy lifting for waterproofing just fine.
The only jobs left for outermost coatings are iirc
further smooth the texture
protect against UV (very important)
be a cool color
For me the key criteria would be maximum long-term compatibility with the primer / adhesive / sealant used, e.g. the Gripper
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