HFS
Well Known Member
PPG Aerospace (maker of "Pro Seal") doesn't even list shear strength in their TDS (Technical Data Sheet) - only tensile strength, 370 psi - not very much when compared to the shear strength of 3M's Scotch Weld 2216 epoxy adhesive - 3200 psi. Almost 10x greater than Pro Seal!
I get that shear & tension strengths are not the same, but the fact that PPG doesn't even list shear strength as a product specification, makes me think they don't recommend using it as an "adhesive".
If you are looking for a suitable adhesive for strength enhancement - I would not suggest Pro Seal - it shears at such low loading conditions, that it actually acts as a lubricant.
I tested several Pro Seal coupons years ago (overlapped shear), and found micro movement across the face of the joint prior to failure. The Scotch Weld coupons tested resisted any movement (or at least discernible) until the moment of catastrophic failure, well above the loading for rivets only.
YMMV - But I bet not by much.
HFS
I get that shear & tension strengths are not the same, but the fact that PPG doesn't even list shear strength as a product specification, makes me think they don't recommend using it as an "adhesive".
If you are looking for a suitable adhesive for strength enhancement - I would not suggest Pro Seal - it shears at such low loading conditions, that it actually acts as a lubricant.
I tested several Pro Seal coupons years ago (overlapped shear), and found micro movement across the face of the joint prior to failure. The Scotch Weld coupons tested resisted any movement (or at least discernible) until the moment of catastrophic failure, well above the loading for rivets only.
YMMV - But I bet not by much.
HFS