cracking plywood with the grain

[ClanB]

Has any of you had the top layer of ply crack with the grain after applying paint or stain? I have on the last two and I swear I did not see any cracks before. I spend time sanding the deck, bottom, edges etc and I am always looking for spots to clean up. I think something like that would not get by me twice in a row.

[spudnut]

Is it Douglas Fir marine grade?

[ClanB]

Yup

[spudnut]

Buy it at Stock?

[ClanB]

Mayan Lumbar.

[krusher74]

temp/humidity change?

[ClanB]

Maybe Krusher. been kinda hot then cold n dry. then dewy ...but it seems both times were when I painted and or stained. It wont ruin the board . I will seal it just fine. Its just odd to me.

[spudnut]

Douglas fir marine ply does this big time. Speaking from frustrated experience. Using fine sand paper could somehow start a new slab of top layer to rip off.

[ClanB]

I just watched board 3 crack in front of my eyes as I applied the wood stain. What other marine ply is available besides Dug Fir?