Another question...

I've used Tamiya White putty twice to fill small gaps.

I lightly sanded the area before applying but, on both occasions, it seemed like it didn't cure properly.

It either flaked away or had the consistency of old chewing gum stuck to the bottom of a table.

Did I do something wrong, or is that typical?

If I go back over the areas with Squadron's, are the two compatible or will I need to get rid of the Tamiya stuff first?