I have a recipe for an English I.P.A. which has 0.500 gr of Carapils but i have run out.Only grains that i have right now for substitute is Cara-Blonde and Crystal EBC 145-155. Will either of those two do or just skip Carapils and start the brew?
I'm sure you'll be fine with the cara-blonde - that's only a few shades lighter than carapils.
It really depends upon what other crystal malts are in the brew. If there are other crystals around the 20-40L, then you may not need so much of the carablonde. Then you could use 250g of that, and 250g of base malt, to avoid it becoming too sweet.