Paint Prep Problem, Any Idea
Thread Starter
Intermediate
Joined: Mar 2002
Posts: 45
Likes: 5
From: Pelham NH
Paint Prep Problem, Any Idea
Le Mans Master
Joined: Dec 2009
Posts: 5,510
Likes: 1,954
From: Plano IL
2026 Corvette of the Year Winner - Unmodified
2025 C1 of the Year - Unmodified Winner
2019 C1 of Year Finalist (stock)
2018 C1 of Year Finalist
Question
Why the epoxy primer over polyester primer ?
They look like fish eyes
can I get a better photo
I would sand them down and see what is under neath
Some thing is the substrate is coming up.
Why the epoxy primer over polyester primer ?
They look like fish eyes
can I get a better photo
I would sand them down and see what is under neath
Some thing is the substrate is coming up.
Melting Slicks
Joined: Mar 2006
Posts: 3,161
Likes: 239
From: Southern CALIFORNIA
It looks like air bubbles in te gel coat. its not from your finish.
it is very common in hand laid glass molds. when the gelcoat is poured on brushed on you can get tiny bubbles from stirring or not flowing properly in tighter parts. and they come thru when you cut down the surface.
usually when the manufacture pops the part out of the mold they do a finish sanding to expose bubbles near the surface and they fill em and primer it. but there can always be more if you shape and sand the surface more.
With experience you can start to notice where there are thinning areas with ar pockets beneath, as the surface kinda springs back. you poke with a awl and the bubble is exposed.
some people just clean it good and add filler. some like to use a mini grinder/dremel to bevel edge the area so the filler wont wanna pop out.
air bubbles are really common on fiberglass c3 bumpers, see this thread,
https://www.corvetteforum.com/forums...-corvette.html
it is very common in hand laid glass molds. when the gelcoat is poured on brushed on you can get tiny bubbles from stirring or not flowing properly in tighter parts. and they come thru when you cut down the surface.
usually when the manufacture pops the part out of the mold they do a finish sanding to expose bubbles near the surface and they fill em and primer it. but there can always be more if you shape and sand the surface more.
With experience you can start to notice where there are thinning areas with ar pockets beneath, as the surface kinda springs back. you poke with a awl and the bubble is exposed.
some people just clean it good and add filler. some like to use a mini grinder/dremel to bevel edge the area so the filler wont wanna pop out.
air bubbles are really common on fiberglass c3 bumpers, see this thread,
https://www.corvetteforum.com/forums...-corvette.html
Le Mans Master
Joined: Dec 2009
Posts: 5,510
Likes: 1,954
From: Plano IL
2026 Corvette of the Year Winner - Unmodified
2025 C1 of the Year - Unmodified Winner
2019 C1 of Year Finalist (stock)
2018 C1 of Year Finalist
for sure - something is coming up thru from the under neath
I would sand it down - see what is underneath.
I would sand it down - see what is underneath.
