Garrett1984
Promoted Users
I have done a lot of reading on this forum and have noticed many people have applied a reduced mixture of epoxy to serve as an adhesion promotor, only to be bummed out their basecoat still has a faulty chemical adhesion. People on this forum have suggested that the “solvents of the epoxy got trapped and couldn’t escape the barrier of basecoat and clear coat, thus, creating a microscopic uncured weak link between the two layers”. Makes sense to me.
The following statement is understood:
“Before I apply a basecoat, I shall first apply a 1:1:1 mixture of SPI epoxy to the substrate to achieve excellent adhesion of the basecoat. Let this mixture flash off and I can apply my basecoat of choice”.
What I don’t understand is why would it not be adequate to apply 2-3 coats of SPI epoxy mixed at a ratio of 1:1… sand to perfection while the epoxy is still considered to be “green”…clean substrate…then apply basecoat within 7 days?
The reason I am confused is because I have the understanding SPI epoxy is still “green” up to 7 days after application. Possibly up to 14 days. If the SPI epoxy is still “green” during the 7 day window… then I believe the basecoat can still have adequate CHEMICAL adhesion if it was applied within 7 days of top of the SPI epoxy. This method of approach will give the epoxy more time to gas off.
Thoughts?
The following statement is understood:
“Before I apply a basecoat, I shall first apply a 1:1:1 mixture of SPI epoxy to the substrate to achieve excellent adhesion of the basecoat. Let this mixture flash off and I can apply my basecoat of choice”.
What I don’t understand is why would it not be adequate to apply 2-3 coats of SPI epoxy mixed at a ratio of 1:1… sand to perfection while the epoxy is still considered to be “green”…clean substrate…then apply basecoat within 7 days?
The reason I am confused is because I have the understanding SPI epoxy is still “green” up to 7 days after application. Possibly up to 14 days. If the SPI epoxy is still “green” during the 7 day window… then I believe the basecoat can still have adequate CHEMICAL adhesion if it was applied within 7 days of top of the SPI epoxy. This method of approach will give the epoxy more time to gas off.
Thoughts?